This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Otosclerosis, Subject name: ENT
[{'content': "A 30-year-old woman presents with progressive conductive deafness bilaterally. The most common cause is: \nSelect and explain. \nA. Tympanosclerosis, B. Otospongiosis, C. Meniere's disease, D. B/L otitis media", 'role': 'user'}, {'content': "Answer: B \nExplanation: (b) Otospongiosis(Ref. Cummings, 6th ed., 2211)Otosclerosis is the most common cause of B/L progressive conductive hearing loss in adults.Meniere's disease presents with U/L SN hearing loss, vertigo and tinnitus.With the kind of presentation mentioned the remaining two options of conductive hearing loss are less common than otosclerosis.", 'role': 'assistant'}]