This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Indication of BAHA {Bone-anchored hearing aid} is \nSelect and explain. \nA. Bilateral hearing loss, B. Sensorineural hearing loss, C. Congenital canal atresia, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bone-anchored hearing aids can be used in People who have chronic inflammation or infection of the ear canal and cannot wear the standard "in the ear" air conduction hearing aids Children with malformed or absent outer ear and ear canals as in microtia or canal atresia Single-sideddeafness. Ref: Dhingra 7e pg 137.', 'role': 'assistant'}]