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
Trough shaped curve in audiometry is seen in - 
Select and explain. 
A. Congenital SNHL, B. Otitis media, C. Otosclerosis, D. Acoustic neuroma
A: Congenital SNHL
Answer: A: Congenital SNHL 
Explanation: None