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
[{'content': 'Impedance denotes: \nSelect and explain. \nA. Site of perforation, B. Disease of cochlea, C. Ds. of ossicles, D. Higher function disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Impenance audiometry, measures the resistance of tympanic membrane and middle ear and also compliance of tympanic membrane and ossicular chain to sound pressure transmission.Tympanogram is the graphic representation of compliance and impendance of tympanic osscular system with air pressure changes.', 'role': 'assistant'}]