Correct Answer: A

Rationale: 5-alpha reductase inhibitors, such as finasteride, decrease the size of the prostate by inhibiting dihydrotestosterone production.

Correct Answer: A

Rationale: Sumatriptan is used to treat acute migraines, not for prevention.

Correct Answer: A

Rationale: The "Christmas tree" pattern and rapid eruption of lesions are characteristic of pityriasis rosea.

Correct Answer: B

Rationale: Vibratory sense is assessed by placing a vibrating tuning fork on bony prominences, commonly the big toe.

Correct Answer: C

Rationale: Neither frailty index nor Fried frailty criteria includes cognition assessment, as frailty is primarily a physical condition.