[For Seniors] Useful! Trivia Quiz & Fun Facts about Blood Types

Last updated:2025/5/14

Social worker / Care workermoko
My name is Moko, a mother of three who admired my mother and worked in the care industry as a care worker and as a medical social worker (MSW) in a hospital. I will be drawing on my previous experience to write mainly about caregiving. Thank you in advance.

Human ABO blood types are divided into four categories: type A, type B, type O, and type AB.

Did you know that certain blood types are more prone to specific illnesses, and that other animals also have blood types?

In this article, we present informative trivia quizzes about blood types.

Even seniors with a wealth of knowledge may discover something they didn’t know.

Gaining new knowledge stimulates the brain and is effective in preventing dementia.

Solving quizzes in groups fosters interaction with others and helps make everyday life more enjoyable.

Please make use of this for recreational activities or in everyday conversations with seniors.

[For Seniors] Useful! Blood Type Trivia Quiz & Fun Facts (1–10)

What is the most common blood type in the world?

Type A
Type B
Blood type O

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Blood type O

Type O is the most common blood type in the world and is considered the most prevalent in many countries. In particular, Type O is the majority in Latin America and Africa.

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Which blood type is more likely to catch a cold?

Type A
Type B
Blood type O

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Type A

Immunologically, it’s said that blood type O has the strongest immunity, followed by B, A, and AB. People with type A are more prone to stress and their immunity tends to decline more easily, so they are considered to have a higher risk of catching colds. However, there are large individual differences, so this doesn’t apply to all people with type A.

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Which blood type has a harder time stopping bleeding?

Type A
Type B
Blood type O

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Blood type O

People with type O blood are generally said to have a harder time stopping bleeding. This is thought to be because their blood has slightly lower concentrations of coagulation factors compared to other blood types. Due to these lower levels, it can be more difficult to stop bleeding after a major injury, and there are data suggesting a higher mortality rate.

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Which blood type tends to attract mosquitoes more easily?

Type A
Type B
Blood type O

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Blood type O

Studies have shown that mosquitoes tend to prefer people with type O blood over other blood types. However, mosquitoes’ preferences for humans can also be influenced by individual environmental factors and other elements, so this does not necessarily apply in every case.

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Which blood type is less likely to develop dementia?

Type A
Type B
Blood type O

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Blood type O

According to research, there is data suggesting that people with type O blood have a lower risk of dementia compared to other blood types. It is said that people with type O blood have more gray matter in the brain than those with other blood types, which may help prevent dementia.

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Which blood type does not exist in cats?

Blood type O
Type B
Type AB

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Blood type O

Just as humans have blood types, cats also have blood types. Unlike humans, cats have types A, B, and AB, but not O. Among these, type A is said to be the most common, accounting for about 80%. Incidentally, type AB is said to be very rare.

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Which blood type is most common among Japanese people?

Type A
Type B
Blood type O

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Type A

Among Japanese people, the most common blood type is Type A, which is said to account for about 40% of the total population in Japan. People with Type A are often considered serious and meticulous. Incidentally, the second most common is Type O, followed by Type B and then Type AB.

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