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': 'As type of tympanogram is seen in: \nSelect and explain. \nA. Otosclerosis, B. Ossicular discontinuity, C. Glue ear, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Otosclerosis) Ref: Dhingra, 3rd ed, p. 34 & 4thed, p. 26As type tympanogram indicates low compliance at or near ambient air pressure.Seen in fixation of ear ossiclesTypes of tympanogram:A -NormalAs - Otosclerosis, malleus fixationAd - Ossicular discontinuity, lax thin TM (High compliance)B - Flat / dome shaped - No change in compliance - Middle ear fluid / Thick TMC - Maximum compliance at -100 mm H2O - Retracted TM', 'role': 'assistant'}]