Correct Answer: Option A

Explanation

Agglutination (clumping) occurs when a specific antibody binds to its corresponding antigen on the surface of red blood cells. Anti-A antibody serum contains antibodies that specifically target the A antigen. 

Blood Group A has A antigens on its red blood cells, so it will clump when mixed with anti-A serum.

The correct option is A - A and AB.

There is an explanation video available below.

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