13. Drug tolerance is when:

A. the body reacts negatively to a drug.

B. a drug does not produce the same effects over a period of time.

C. a person feels physical symptoms if they stop taking a drug.

D. a person has a strong craving for a drug.

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14. Which of the following drugs would be considered a stimulant?

A. Valium

B. heroin

C. methamphetamine

D. aspirin