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On what basis is the blood group classified?

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in Clinical Science by (102k points)
On what basis is the blood group classified?

(a) Antigen and antibody

(b) Haemoglobin content

(c) Rhesus Factor

(d) Oxygen Content

The question was posed to me in homework.

Origin of the question is Blood Groups in division Pathology of Clinical Science

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The correct choice is (a) Antigen and antibody

To explain: The blood groups have antigens which produce antibodies for the opposite blood group. Thus, blood group A has antigen A and it produces antibody B against the blood group B which contains antigen B. When a blood test is done, the blood of group A will clump up when antigen B is added to the taken blood. In the same way, the blood of group B will clump when antigen A is added. For blood group AB, no clumping happens and for group O, clumping happens for both Antigen A and B.

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