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Question

Which antibodies are found in the plasma of a person with type B blood?

A
Antibody-A, but not antibody-B
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B
Neither antibody-A nor antibody-B
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C
Both antibody-A and antibody-B
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D
Antibody-B, but not antibody-A
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Solution

The correct option is A Antibody-A, but not antibody-B
The plasma of different individuals contain two natural antibodies (proteins produced in response to antigens) namely A and B. If an antigen is mixed with its corresponding antibody then it leads to agglutination (clumping). Hence, blood groups with antigen B on its surface should not contain antibody B in its plasma. Therefore, person with B blood group has A antibodies and person with A blood group has B antibodies, whereas a person with AB blood group has no antibody and the one with O blood group has both A and B antibodies.

Blood groupAntigens on RBCsAntibodies in PlasmaDonor's GroupAAanti-BA,OBBanti-AB,OABA,BnilAB, A, B, OOnilanti-A, BO

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