This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'In tubo-tympanic CSOM commonest operation done is: \nSelect and explain. \nA. Modified radical mastoidectomy, B. Radical mastoidectomy, C. Simple mastoidectomy, D. Tympanoplasty', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (d) Tympanoplasty(Ref. Scott Brown, 8th ed., Vol 2; 997)Management of tubo-tympanic CSOM is tympanoplastyRadical and modified radical mastoidectomy are done for unsafe CSOM.Simple mastoidectomy or Schwartze operation is done for acute and coalescent mastoiditis.', 'role': 'assistant'}]