This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic & Operative ENT, Subject name: ENT
[{'content': 'Modified radical mastoidectomy is indicated in all except - \nSelect and explain. \nA. Safe CSOM, B. Unsafe CSOM with attticoantra! disease, C. Coalescent mastoiditis, D. Limited mastoid pathology', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans- A in safe tympanoplasty is done', 'role': 'assistant'}]