T-cell and B-cell lymphocytes are the primary participants in the immune response. What do they do?
a) T-cell and B-cell lymphocytes distinguish harmful substances and ignore those natural and unique to a person.
b) T-cell and B-cell lymphocytes respond to the body's invasion by macrophages.
c) T-cell and B-cell lymphocytes react to the body's lack of B12 .
d) T-cell and B-cell lymphocytes distinguish harmful treatments from curative treatments.
Answer: A
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