Discussion
Assertion (A) : All humans have A antigens in blood.
Reason (R) : Because it produces both anti-A and anti-B antibodies.
Codes :
Answer: C
Both statements are incorrect, option (C). Not all human beings have A antigens in the blood: people of group O and group B have no A antigen on their red cells. So the assertion is false.
The reason is also false. A person does not make both anti-A and anti-B antibodies in general: a person of group A makes anti-B only, a person of group B makes anti-A only, and only group O makes both. Moreover, the antibodies are the result of the absence of an antigen, not the cause of having it. So (A), (B) and (D) are wrong.
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