This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'During normal conversation sound heard at a 1meter distance is \nSelect and explain. \nA. 60dB, B. 80dB, C. 90dB, D. 1200dB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Intensity: It is the strength of sound which determines its loudness. It is usually measured in decibels. At a distance of 1 m, intensity of Whisper = 30 dB Normal conversation = 60 dB Shout = 90 dB Discomfo of the ear = 120 dB Pain in the ear = 130 dB Ref : Diseases of ENT by Dhingra 6th edition Pgno : 19', 'role': 'assistant'}]