**ABO blood group system**: a person with blood group O has:
AA antigen and B antigen, no antibodies
BNeither A nor B antigens; has anti-A AND anti-B antibodies in plasma
CBoth antigens AND both antibodies
DA antigen, anti-A antibody
Answer & Solution
Correct answer: B. Neither A nor B antigens; has anti-A AND anti-B antibodies in plasma
Group O: genotype $ii$. No A/B antigens on RBC, but plasma contains anti-A AND anti-B antibodies. 'Universal donor' (RBCs accepted by all). 'Universal recipient' = AB (no antibodies). RhD factor adds another layer.
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