This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Normal safe limit of Fluoride content in drinking water is \nSelect and explain. \nA. 0.5 to 0.8 mg/L, B. 0.8 to 1.0 mg/L, C. 0.2 to 0.5 mg/L, D. 0.2 to 0.8 mg/L', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The recommended level of fluorides in drinking water in India is accepted as 0.5 to 0.8 mg per literRef: Park; 23rd ed; Pg 625', 'role': 'assistant'}]