Question

A person with blood group 'A' can donate blood to the persons with blood group 'AB' because it

• A. Has both 'A' and 'B' antigens
• B. Has only 'A' antigen and 'B' antibodies
• C. Has only 'B' antigen and 'A' antibodies
• D. Does not have any antigens and antibodies

Answer 1

The correct option is B Has only 'A' antigen and 'B' antibodies

In the ABO blood group system, there are four types of blood group A, B, AB and O. There are two antigens and two antibodies that are mostly responsible for the type of blood group. People with type A have antigen A and antibodies against type B in the blood. Similarly, a person with blood group B has antigen B and antibody against type A in the blood. Individuals with blood group O do not produce any antigen but have antibody A and B. That's why when any person is given the blood of O group, it will not be rejected. An individual with blood group AB has both antigen A and B but no antibodies. That's why they can receive the blood of any group. So, a person with blood group A can donate blood to the persons with blood group AB because the person it has only A antigens and B antibodies. The receiver's blood will not recognize it as foreign and hence, not be rejected.