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': 'Prolonged exposure to noise levels greater than the following can impair hearing permanently - \nSelect and explain. \nA. 40 decibels, B. 85 decibels, C. 100 decibels, D. 140 decibels', 'role': 'user'}, {'content': "Answer: C \nExplanation: Repeated or continuous exposure to the noise around 100 decibels may result in a permanent hearing loss; inner ear damage may vary from minor changes in the hair cells to complete destruction of the organ of Coi. Park's Textbook of Preventive and Social Medicine, 22nd edition, Page No. 689", 'role': 'assistant'}]