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': 'In a case of bilateral hearing loss, what should be done-a) Stapedectomyb) Cochlear implantc) Hearing aid bone implant d) Sodium fluoride \nSelect and explain. \nA. abc, B. acd, C. bcd, D. abcd', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]