Final answer:
The most characteristic symptom of otosclerosis is a progressive, bilateral loss of hearing.
Step-by-step explanation:
The most characteristic symptom of otosclerosis is a progressive, bilateral loss of hearing. Otosclerosis is a condition where there is abnormal bone growth in the middle ear, specifically around the tiny bones called the ossicles. This excessive bone growth can interfere with the transmission of sound and lead to hearing loss.
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