An elderly client is diagnosed with cancer. While reviewing age-related changes in the immune system, the nurse identifies which of the following as having contributed to this client's condition?
a) Impaired ciliary action from exposure to environmental toxins
b) Decreased sensation and slowing of reflexes
c) Failure of lymphocytes to recognize mutant cells
d) Failure of immune system to differentiate "self" from "non-self"
Answer: C
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