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': 'Auditory fatigue is at ? \nSelect and explain. \nA. 90 dB 4000 Hz, B. 110 dB 4000 Hz, C. 130 dB 4000 Hz, D. 150 db 4000 Hz', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 90 dB 4000 Hz", 'role': 'assistant'}]