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During blood typing agglutination indicates that the

1. RBC carry certain antigens
2. Plasma contains certain antigens
3. RBC carry certain antibodies
4. Plasma contains certain antibodies

Correct answer: RBC carry certain antigens

Solution

Agglutination occurs when antibodies in the typing serum bind to their corresponding antigens on red blood cells, causing visible clumping. Therefore, a positive reaction shows that the RBCs carry the specific antigens being tested for.

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