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: Social & Preventive Medicine
[{'content': 'Acceptable noise level in industries ? \nSelect and explain. \nA. 25-30 dB, B. 30-40 dB, C. 40-50 dB, D. 60-80 dB', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e.,40 50 dB", 'role': 'assistant'}]