<prompt> A 30-year-old woman presents with progressive conductive deafness bilaterally. The most common cause is:TympanosclerosisOtospongiosisMenieres diseaseBL otitis media  <response>: b OtospongiosisRef. Cummings, 6th ed., 2211Otosclerosis is the most common cause of BL progressive conductive hearing loss in adults.Menieres disease presents with UL 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. 