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': 'Prolonged exposure to noise levels greater than the following can impair hearing permanently: \nSelect and explain. \nA. 40 decibels, B. 85 decibels, C. 100 decibels, D. 140 decibels', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A noise of 90 dB SPL, 8 hours a day for 5 days per week is the maximum safe limit as recommended by ministry of labour, govt of India-rules under factories act.', 'role': 'assistant'}]