Which statement shows the correct relationship between the terms antibody and antigen?
A. An antibody is a substance produced by the body in response to an antigen.
B. An antigen is a substance that causes the body to produce antibodies.
C. "Antibody" is a shortened form of antitoxic (against poison) body; the body views most antigens as poison and thus produces an antibody in defense.
D. All of these.
E. None of these.
Answer: D
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