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Discussion

Persons with blood group A possess

  • A.Antigen A and antibody b
  • B.Antigen A and antibody a
  • C.No antigen but antibodies a and b
  • D.Antigens A and B but no antibodies

Answer: A

Correct answer: Antigen A and antibody b

In the ABO system a person carries the antigen of their own group and the antibody against the other. Group A red cells therefore bear antigen A, and the plasma contains anti-B. Having anti-A as well would destroy the person’s own cells.

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