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': 'Maximurn permitted level of fluoride in drinking water is meq/L: \nSelect and explain. \nA. 0.5, B. 0.8, C. 1, D. 1.5', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 1', 'role': 'assistant'}]