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
Otoacoustic emissions are derived from: 
Select and explain. 
A. Tympanic membrane, B. Ossicles, C. Cochlea, D. Vestibule
C: Cochlea
Answer: C: Cochlea 
Explanation: Ans. (c) CochleaRef: Dhingra's ENT 5th ed. / 32* Otoacoustic emission (OAE) are low intensity sounds produced by outer hair cells of a normal cochlea.* These sounds produced by outer hair cells travels in a reverse direction: outer hair cells - basilar membrane - perilymph - oval window - ossicles - tympanic membrane - ear canal.* When outer hair cells are damaged, OAE are absent. Hence it helps to know the function of cochlea.