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A person with blood group A requires blood. The blood group which can be given is

1. A and B
2. A and AB
3. A and O
4. A, B, AB and O

Correct answer: A and O

Solution

A person with blood group A has A antigens and anti-B antibodies, so they can safely receive red blood cells from group A or group O. Group O has no A or B antigens, and group A matches their own antigen.

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