During blood transfusion, agglutination may occur as a result of the reaction between
contrasting antigens and antibodies
two different antigens
two different antibodies
similar antigens and antibodies
Correct answer is D
For example, take the blood group A, it has antigen A and antibody B. When the anti-A antibody is used on this blood group, it causes a clumping. The anti-A antibody contains Antigen A. Hence, the clumping which is called AGGLUTINATION.