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': "Gelle's test is done/ negative in: \nSelect and explain. \nA. Senile deafness, B. Traumatic deafness, C. Otosclerosis, D. Serous otitis media", 'role': 'user'}, {'content': "Answer: C \nExplanation: Gelle's test is positive: In normal individuals, SNHL. Gelle's test is negative: In case of fixed ossicular chain (otosclerosis) or if ossicular chain is disconnected.", 'role': 'assistant'}]