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': 'Normal voice heard from 1 meter, intensity of sound reaching ear is \nSelect and explain. \nA. 20 dB, B. 40 dB, C. 60 dB, D. 80 dB', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. 60dB Intensity is the strength of sound which determines its loudness. It is usually measured in deeibeis (dB). o Following are intensities when a person is at a distance of one meter from sound source. Whisper 30dB Normal conversation 60dB Shout 90 dB Discomfo of ear 120dB Fain in ear 130 dB", 'role': 'assistant'}]