The theory called clonal selection says
A. Exposure to an antigen activates those T- and B-cells with receptors recognizing specific epitopes on the antigen
B. B cells provide resistance through direct cell-to-cell contact with, and lysis of, infected or otherwise abnormal cells
C. T cells are involved in the process by which antibodies are produced against epitopes
D. The activation of T cells produces antibodies that recognize epitopes
Answer: A. Exposure to an antigen activates those T- and B-cells with receptors recognizing specific epitopes on the antigen
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