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
To distinguish between cochlear and post cochlear damage test done is - 
Select and explain. 
A. Brainstem evoked response, B. Impedance audiometry, C. Pure tone audiometry, D. Auditory cochlear potential
A: Brainstem evoked response
Answer: A: Brainstem evoked response 
Explanation: BERA is very useful in distinguishing between cochlear pathology and retrocochlear pathology for SNHL
Impedence audiometry and PTA tests the middle ear pathology.