Which Statement About the Role of the Endogenous Opioid System

Which statement about the role of the endogenous opioid system in alcohol's reinforcing effects is false?

A) Mice that lack the μ-opioid receptor do not self-administer alcohol.
B) Opioid receptor antagonists reduce alcohol self-administration in animals.
C) Clinical trials show that opioid receptor antagonists reduce alcohol craving and relapse in humans.
D) Chronic alcohol use increases gene expression of endorphin and enkephalin.

Correct Answer:

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