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RBCs have

1. Antigen (agglutinogen) on their surface
2. Carbonic anhydrase
3. Antibody on their surface
4. Both A and B

Correct answer: Both A and B

Solution

Red blood cells have surface antigens called agglutinogens, which determine blood group. They also contain carbonic anhydrase, an enzyme that helps convert carbon dioxide to bicarbonate for transport in blood.

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