Which of the following are NOT correctly paired?

Correct Answer: D

Rationale: Buspirone (choice A), Alprazolam (choice B), and Baclofen (choice C) are correctly paired (anxiolytic, some antidepressant effect, less sedative muscle relaxant). Oxazepam (choice D), a benzodiazepine, isn't a TCA, making it the incorrect pair. This tests drug classification.

Correct Answer: B

Rationale: LSD exerts its hallucinogenic effects through serotonin (5-HT) receptor modulation.

Correct Answer: A

Rationale: Amitriptyline is a tricyclic antidepressant that increases the availability of norepinephrine and serotonin, making it a likely choice for the treatment of depression in this patient.

Correct Answer: C

Rationale: Enalapril is an ACE inhibitor with no significant anti-inflammatory action.

Correct Answer: C

Rationale: The correct answer is C: Cyclobenzaprine. Cyclobenzaprine is a centrally acting muscle relaxant commonly used to treat muscle spasticity in conditions like multiple sclerosis. It works by inhibiting nerve impulses to reduce muscle spasms. Neostigmine (A) is a cholinesterase inhibitor used for myasthenia gravis, not spasticity. Ropinirole (B) is a dopamine agonist used for Parkinson's disease and restless legs syndrome, not spasticity. Pyridostigmine (D) is also a cholinesterase inhibitor used for myasthenia gravis, not spasticity.