This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (E.N.T.), Subject name: ENT
[{'content': 'Cochlear implants are used for \nSelect and explain. \nA. In refractory vertigo, B. Sever tinnitus, C. Moderate & severe hearing loss, D. Loss of balance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Moderate and severe hearing loss # Cochlear implant stimulate auditory system with electrical impulses, while hearing aid use surviving hair cells.# Indications of cochlear implant:> Postlingually deaf patient (hearing loss after development of language)> Bilateral severe sensorineural deafness who do not respond to amplified sound stimuli.> Inability to benefit from hearing aid.> In order to select the patient for cochlear implant following tests are done to evaluate the degree of deafness and to assess the quality of surviving neuron. Pure tone audiometry, Electrocochleography, Promontory stimulation', 'role': 'assistant'}]