In an agglutination test for ABO blood typing, antigen B binds to?

Question

In an agglutination test for ABO blood typing, antigen B binds to

a. antibody A.

b. antibody B.

c. antibodies A and B.

d. neither antibody A nor B.

a?

Answer 1

The answers is b. Antibody B

For agglutination to occur an antigen-antibody reaction has to occur which results in clumping of the blood cells. Antibodies' idiotype are specific for the epitope they bind so only antibody B can bind antigen B.

Answer 2

i think it binds to antibody A