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Which of these acts as an analgesic without producing addiction or mood alteration?

1. Codeine
2. Heroin
3. Morphine
4. N-Acetyl-para-aminophenol

Correct answer: N-Acetyl-para-aminophenol

Solution

Codeine, heroin and morphine are narcotic opioids causing addiction/mood changes, whereas N-acetyl-para-aminophenol (paracetamol) is a non-narcotic analgesic.

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