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which of the following is an opioid?
select one:
a. fentanyl
b. prozac
c. caffeine
d. marijuana
e. alcohol

Explanation:

Opioids are substances that bind to opioid receptors in the body. Fentanyl is a synthetic opioid. Prozac is an antidepressant (a selective serotonin reuptake inhibitor - SSRI). Caffeine is a stimulant. Marijuana is a cannabinoid - containing drug. Alcohol is a depressant.

Answer:

A. fentanyl