Given below are two statements : one is labelled as Assertion (A) and the other is labelled as
Reason (R).

Assertion (A) : A person with blood group O is supposed to be an universal donor.

Reason (R): Group O does not contain any antigens.
In the light of the above statements, choose the correct answer from the options given below :

Assertion (A) states that a person with blood group O is supposed to be a universal donor. This statement is scientifically accurate because individuals with blood group O can donate blood to recipients of any other blood group. Their red blood cells do not have A or B antigens on their surface, which minimizes the risk of an immune reaction when their blood is transfused into someone with a different blood group.

The Reason (R) explains that blood group O contains no antigens. This statement is correct because individuals with blood group O lack A and B antigens in their red blood cells. The absence of these antigens means that the recipient's immune system is less likely to recognize the donor blood as foreign, making it safe for transfusion across different blood groups.

Finally, the Reason (R) directly and sufficiently explains why the Assertion (A) is accurate. The universal donor status of blood group O is entirely due to the absence of A and B antigens, which is why the Reason is the correct explanation for the Assertion.

Hence, Both statements are correct, and the Reason explains the Assertion appropriately.