From the behaviorist perspective, the reduction in pain that follows taking a placebo is a conditioned response

Which statement about the immune system is correct?

Males tend to have a stronger immune system than females. Women tend to have stronger immune systems than do men. The vulnerability of AIDS patients to diseases that are normally reserved for young children is evidence of the relation between a weakened immune system and aging. The immune system gets stronger throughout life as people are exposed to more types of invaders.

If repeated exposure to a drug increases the activity of the CYP450 enzyme that is responsible for metabolizing that drug, then later doses will be less effective than the first few doses. This is an example of

A. drug disposition tolerance. B. behavioral tolerance. C. an active metabolite. D. a prodrug.