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': 'Gelle test is used for \nSelect and explain. \nA. Otosclerosis, B. Noise-induced hearing loss, C. Sensorineural deafness, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gelle&;s test is performed by placing a vibrating fork on the mastoid while changes in air pressure in the ear canal are brought about by Siegle&;s speculum. The test is positive in otosclerosis.Ref: Hazarika; 3rd ed; Pg 179', 'role': 'assistant'}]