This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Surgery, Subject name: ENT
[{'content': 'Radical mastoidectomy is done for: \nSelect and explain. \nA. ASOM, B. Safe CSOM, C. Atticoantral cholesteatoma, D. Acute mastoiditis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (c) Atticoantral cholesteatoma(Ref. Cummings, 6th ed., 2190)These days MRM is preferred over radical mastoidectomy in the management of unsafe CSOM with or without complications except for a few areas', 'role': 'assistant'}]