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If the blood of two different groups is mixed together, what problem is observed?

(a) Coagulation

(b) Agglutination

(c) Thrombus formation

(d) Embolism

I got this question at a job interview.

This interesting question is from Blood Groups topic in section Pathology of Clinical Science

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The correct option is (b) Agglutination

For explanation I would say: The blood group is determined by the presence of antigen on the surface of the blood cells. When this antigen exists for one group, an antibody for the other group will exist as well. Thus, when the blood of the opposing group enters the body, the antibody attacks the antigen and they form a clump. This is called as agglutination.

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