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
Gelle's test is done/ negative in: 
Select and explain. 
A. Senile deafness, B. Traumatic deafness, C. Otosclerosis, D. Serous otitis media
C: Otosclerosis
Answer: C: Otosclerosis 
Explanation: 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.