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
Otoacoustic emissions arise from ______ 
Select and explain. 
A. Outer hair cells, B. Inner hair cells, C. Both, D. Organ of coi
A: Outer hair cells
Answer: A: Outer hair cells 
Explanation: Otoacoustic Emissions (OAEs) They are low intensity sounds produced by outer hair cells of a normal cochlea and can be elicited by a very sensitive microphone placed in the external ear canal and an analysis by a computer. Sound produced by outer hair cells travels in a reverse direction: Outer hair cells-basilar membrane- perilymph- oval window- ossicles- tympanic membrane- ear canal.