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': 'A 31 year old female patient complainsts of bilateral impairment of hearing for the 5 year.On examination, tympanic membrane is normal and audiomgram shows a bilateral conductive deafness. Impedance audiometry shows As type of curve and acoustic reflexes are absent. All constitute part of treatment,except - \nSelect and explain. \nA. Hearing aid, B. Stapedectomy, C. Sodium fluoride, D. Gentamycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]