This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Otosclerosis, Subject name: ENT
[{'content': "Gelle's test is for: \nSelect and explain. \nA. Otosclerosis, B. NHL, C. Sensorineural deafness, D. None", 'role': 'user'}, {'content': "Answer: A \nExplanation: (a) Otosclerosis(Ref. Dhingra, 6th ed., 22)Gelle's is negative in otosclerosis, i.e. change in the pressure of EAC does not produce any change in hearing as Ossicular chain is already fixed.", 'role': 'assistant'}]