A blood donor is found to have antigen B in his blood. The donor can donate blood to individuals having blood group:

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A A, AB, B
B AB, B
C O, A, B
D AB, O, B

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Answer: B. AB, B

The donor has antigen B on their red cells. Recipients must lack anti-B antibodies to accept it. People with blood groups B and AB lack these antibodies. Therefore, they can safely receive this blood. Individuals with blood groups A and O have anti-B antibodies. Their immune systems would attack the donor cells.

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A blood donor is found to have antigen B in his blood. The donor can donate blood to individuals having blood group:

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