Which of these is a valid example of an antigen and its corresponding epitope? Select one: a. An antigen is a retrovirus and an epitope is a portion of the retrovirus to which an antibody or T-cell binds. b. An antigen is an antibody and an epitope is the cytotoxic T-cell produced to degrade the antibody. c. None of these choices. d. An antigen is a cytotoxic T-cell and an epitope is a molecular portion of foreign material. e. An antigen is an antibody and the epitope is a virus to which the antigen binds.

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A:

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