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': 'Sound intensity of whispering \nSelect and explain. \nA. 30 dB, B. 60 dB, C. 90 dB, D. 120 dB', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 30 dB * Following are intensities when a person is at a distance of one meter from sound source.Whisper30 dBNormal conversation60 dBShout90 dBDiscomfort of ear120 dBPain in ear130 dB", 'role': 'assistant'}]