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The grouping of blood is based on substances called

  • A.Antibodies
  • B.Antigens
  • C.Antitoxin
  • D.Enzymes

Answer: B

Blood grouping is based on antigens on the surface of the red cells.

The A and B antigens define the ABO groups and the D antigen the Rh factor. The corresponding antibodies are in the plasma, and it is the reaction between an antigen and its antibody that makes an incompatible transfusion dangerous.

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