This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Function of ear ossicles is 
Select and explain. 
A. Impedance matching, B. Amplification, C. Equilibrium, D. None
A: Impedance matching
Answer: A: Impedance matching 
Explanation: Function of ear ossicles is Impedance matching mechanism or transformer action It is accomplished by lever action of ossicles(handle of the malleus is 1.3 times longer than the long process of the incus, providing a mechanical advantage of 1.3) and hydraulic action of the tympanic membrane(area of tympanic membrane is larger than the area footplate of stapes) Ref: PL Dhingra 6th edition of Ear, Nose and Throat; pg no 14