Question

A drop of blood from a blood donor is mixed with serum from a group A person and serum from a group B person. The donor's red cells clumped in the A serum but not in the B serum. What is the donor's blood group?

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is B B

The coagulation test is used to determine the blood group of the individual. The blood is tested with the antiserum to know the type of blood group. There is B antigen in the blood group B which react with the antibody in the antiserum B. This results in the clotting of the blood. There is no antigen A in blood group B which will react in the antibody a of the antiserum A.

Thus, the correct answer is option B.