Discussion
O blood group is universal donor because the blood has
Answer: D
Correct answer: No antigens
Group O red cells carry neither A nor B antigen, so there is nothing on them for an anti-A or anti-B antibody in the recipient to attack - which is why O is the universal donor. The recipient’s own group does not matter for the same reason. (O plasma does carry both antibodies, which is why O is not a universal plasma donor.)
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