If you transfuse type AB blood into a patient with type A blood, the patient will raise antibodies against the B antigen on the donor's blood, but will not raise antibodies against the A antigen. Why not?
A. B and T cells that recognize the A antigen will have been removed by clonal deletion.
B. Antibodies that recognize the A antigen will have been removed by the spleen.
C. Antibodies that recognize the A antigen will have been removed by the bone marrow.
D. Macrophages will not present the A antigen to T cells.
E. Recombination of the gene for antibodies cannot produce self-reactive clones.
A. B and T cells that recognize the A antigen will have been removed by clonal deletion.
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