Question

When red blood corpuscles containing both A and B antigens are mixed with your blood serum, they agglutinate. Then what might be your blood group?

• A. AB
• B. O
• C. A
• D. B

Answer 1

The correct option is A AB

If one belongs to the blood group A, they have A antigens on the surface of their red blood cells and B antibodies in their blood plasma. If one belongs to the blood group AB, they have both A and B antigens on the surface of their red blood cells and no antibodies at all in their blood plasma. If one belongs to the blood group 0 (null), they have neither A or B antigens on the surface of their red blood cells but they have both A and B antibodies in their blood plasma and thus can agglutinate the blood with antigen A and B. Thus, the correct answer is option A.