With the repeated use of substances such as cocaine, heroin, and amphetamines, more of the drug is needed to produce the desired effects. Which of the following helps explain this statement?
A. The brain reduces its production of dopamine.
B. People's expectations of the drug reduce over time.
C. Tolerance toward the drug fails to develop.
D. The brain's control network starts to overpower its reward network.
Answer: A
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