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
Impedance audiometry is for 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: Impedence autiometry is used to find the health or diseased status of middle ear.