Assertion : Type 'O' blood group individuals are called universal donors
Reason : RBCs of 'O' blood group have both 'A' and 'B' surface antigens.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

C

Explanation

If a blood transfusion is made between an incompatible donor and recipient, reaction of antigens on the cells and antibodies in the plasma produces clots that clog the caplilaries. Type O blood group individuals are without A and B antigens on their RBCs, but have antibodies for both those antigens in their plasma. Hence, these can donate blood to anyone.