This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'All are true about cochlear implant except: \nSelect and explain. \nA. Minimum age is 1 year, B. PTA of 70 dB or more, C. Switch on is done after 3 weeks, D. MRI has no role in pre op assessment', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pre op investigation done before an implant is placedComplete audiological evaluationHRCT', 'role': 'assistant'}]