<prompt> Lady has BL hearing loss since 4 years which worsened during pregnancy.Type of impedance audiometry graph will be:AdAsBC  <response>: Ans. B As curveRef. Dhingra 5thed p 30, 97-98, 6thed p 87Lady presenting with hearing lossBilateral hearing lossWhich worsens during pregnancy Leaves no confusion - for otosclerosis being the diagnosis.In otosclerosis - impedance audiometry shows As type of curve. Note :In the early disease since middle ear aeration is not affected patient shows as Type A curve 