Which drug corresponds to Nabilone?

• A. Nabilone
• B. Tincture of Opium
• C. Methadone
• D. Morphine

Answer: (A)

Distinguishing drug classes by name and mechanism is what this question tests. Nabilone is a synthetic cannabinoid used medically as an antiemetic, acting on cannabinoid receptors in the central nervous system. The other options are opioids or opioid-containing products—opium tincture contains morphine and other alkaloids, methadone is a synthetic opioid, and morphine is a natural opioid analgesic. Because the only cannabinoid in the list is Nabilone, it is the correct match. The key idea is recognizing cannabinoids versus opioids based on both naming and pharmacologic class.