What evidence has been cited by scientists who propose that alcoholism is related to endogenous opioid production?

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Opioid-antagonists like naltrexone can reduce the subjective "high" experienced by individuals who drink alcohol, suggesting a relationship between endogenous opioid production and alcoholism. This finding is supported by other research indicating that individuals with a family history of alcoholism have higher levels of endogenous opioids in their brains, and that alcohol consumption can increase the release of endogenous opioids. Answers A, B, and C are not directly related to the proposed relationship between alcoholism and endogenous opioid production.

What Evidence Has Been Cited by Scientists Who Propose That