Multiple choice

Clumping of RBC may occur when the blood of one person is mixed with the serum or blood of another person. This is due to

  1. antigen – antibody reaction

  2. antitoxin – antibody reaction

  3. antitoxin – antigen reaction

  4. antibody – antibody reaction

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A Correct answer
Explanation

Clumping of RBC may occur when the blood of one person is mixed with the serum or blood of another person due to antigen – antibody reaction.