Detection of blood group is done by an agglutination test using antiserum. According to this:

  • A
    If the blood shows coagulation with antiserum $B$,the blood group is $B$.
  • B
    If the blood shows coagulation with both antiserum $A$ and $B$,the blood group is $O$.
  • C
    If the blood shows coagulation with antiserum $A$,the blood group is $AB$.
  • D
    None of these.

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