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': 'Fluoride to be present in water (mg/1,) to prevent caries - \nSelect and explain. \nA. 2, B. 0.4, C. 0.3, D. 0.5', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 0.5 o The recommended level of fluorides in drinking water to prevent caries is 0.5-0.8 mg/L. o But maximum permissible limit is 15 ing/L.", 'role': 'assistant'}]