Concept:The ABO blood group system classifies blood based on the presence (or absence) of A and B antigens on red blood cells and corresponding antibodies in plasma. The universal acceptor blood group has no antibodies, so it can receive blood from all groups.Explanation:Blood group AB has both A and B antigens on red cells and no anti‑A or anti‑B antibodies in plasma. This absence of antibodies means the recipient’s immune system will not attack donor red cells from any ABO group. Therefore, a person with AB blood can safely receive blood from A, B, AB, or O donors. The table below shows all blood groups and their donor compatibility:
Blood Group
Antigens on RBCs
Antibodies in Plasma
Donor’s Group
A
A
anti-B
A, O
B
B
anti-A
B, O
AB
A B
nil
AB, A, B, O
O
nil
anti-A, B
O
Because AB blood has no antibodies, it accepts all ABO blood types. Hence, AB is the universal acceptor.Answer:C. AB