During a Dix-Hallpike maneuver toward the right, a patient develops upbeating torsional nystagmus after a brief latency that fatigues within a minute. This MOST indicates:

• 1 Bilateral vestibular hypofunction from ototoxic medication
• 2 An acute unilateral vestibular neuritis in the acute stage
• 3 Benign paroxysmal positional vertigo involving the right posterior canal ✓ 정답
• 4 A central vestibular lesion requiring urgent imaging

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