This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hearing Loss, Subject name: ENT
Impedance audiometry is for the pathology of: 
Select and explain. 
A. External ear, B. Middle ear, C. Mastoid air cell, D. Inner ear
B: Middle ear
Answer: B: Middle ear 
Explanation: (b) Middle ear(Ref. Cummings, 6th ed., 2203)In impedance audiometry we do tympanometry which is a measure of the condition of the middle ear at the level of TM.