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': 'In majority of cases with otosclerosis the tympanic membrane is: \nSelect and explain. \nA. Normal, B. Flamingo pink, C. Blue, D. Yellow', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Normal(Ref. Shambaugh, 6th ed., 531)In 90% patients of otosclerosis the tympanic membrane appears normal, i.e. pearly white.In 10% cases which are active tympanic membrane is flamingo pink.Blue TM is a feature of glue ear because of cholesterol granuloma.Yellow TM is not seen in any condition', 'role': 'assistant'}]