Detection of blood group is done by agglutinisation test using antiserum. According to this which of the following is correct?

If the blood shows coagulation with antiserum B, the blood group is B.

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If the blood shows coagulation with both antiserum A and B, the blood group is O.

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If the blood shows coagulation with antiserum A, the blood group is AB.

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None of the above.

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Solution

The correct option is A If the blood shows coagulation with antiserum B, the blood group is B.
Agglutinisation if observed when antiserum B is mixed, will be blood group B. It is the test for checking blood group.

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