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The question
A 32-year-old woman with bilateral otosclerosis has an air-bone gap on audiometry, and her bone conduction curve shows a dip at 2 kHz in both ears. The ENT resident lists four statements about this dip: 1. It is greatest at about 2 kHz in the bone conduction curve. 2. It reflects permanent damage to the cochlear hair cells. 3. It usually disappears after a successful stapedotomy. 4. It is seen only in the air conduction curve. Which statements are correct?
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