a person with blood group AB has

A person with blood group A has

A person with blood group A has

A person with blood group-A has

Assertion (A): person with blood group AB can take blood from any other person . Reason(R ):Blood group incompatibility is due to antigen-antibody reaction .Blood group AB has no antibody and thus the antigen of other group is not affected.

To a person with blood group A which one of the following group of blood can be given -----

Why is a person having blood group AB called universal recipient and a person with blood group O called a universal donor?