Anti-A and Anti-B Blood Typing Antibodies are of Which Class

Question

Anti-A and Anti-B blood typing antibodies are of which class?
A) IgG
B) IgE
C) IgD
D) IgM
E) IgA

Accepted Answer

Anti-A and Anti-B antibodies are produced by the B cells of the immune system in response to exposure to the A and B blood group antigens. These antibodies are of the IgM class and are involved in the agglutination (clumping) of the foreign blood cells, leading to their destruction in the body. IgM antibodies are the largest of the five major classes of immunoglobulins and are the first to be produced in response to an infection or in the process of blood typing.