This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, 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 dBAcceptable Noise levelsEnvironmentPlaceAcceptable noise level dB (A)ResidentialBed room25Living room40 Office35-45CommercialConference40-45 Restaurants40-60IndustrialWorkshoopWorkshoop40-6040-50EducationalClass room30-40Library35 - 40HospitalsWards20-35", 'role': 'assistant'}]