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': 'The intensity of sound that does not cause ear damage- \nSelect and explain. \nA. 80, B. 100, C. 120, D. 150', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' Le., 80 o Intensity is the strength of sound which determines its loudness. It is usually measured in decibels (dB). o Following are intensities when a person is at a distance of one meter from a sound source. Whisper 30 dB Normal conversation 60 dB Shout 90 dB Discomfort of ear 120 dB Pain in ear 130 dB o A daily exposure up to 85 dB is the about the limit people can tolerate without substantial damage to their hearing.", 'role': 'assistant'}]