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': 'True about otoacoustic emissions -a) Are accousted by product of outer hair cellb) Are accousted by product of inner hair cellc) Used as a screening test of hearing in newborn infantd) Useful in ototoxicity monitoringe) Disappear in 8th nerve pathology \nSelect and explain. \nA. acd, B. ad, C. bc, D. bde', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]