This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': "Characteristic feature of Otosclerosis are all except- \nSelect and explain. \nA. Conductive deafness, B. Positive rinne's test, C. Paracusis willisii, D. Mobile ear drum", 'role': 'user'}, {'content': 'Answer: B \nExplanation: You are aware of all options given in Question.\nJust Remember: The following otoscopic findings in otosclerosis.\nRemember:\n\nTympanic membrane is normal and mobile in 90% cases. (i.e. option d is correct).\nSchwartz sign—Flammingo cases pink colour of tympanic membrane is seen in 10% cases. It indicates active focus with increased vascularity.\nStapes footplate—Shows a rice grain / biscuit type appearance\nBlue mantles are seen histopathologically.', 'role': 'assistant'}]