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': 'Which of the following is the accepted safe level of flouride in drinking water ? \nSelect and explain. \nA. 0.5 - 0.8 ppm, B. 1.5 - 3 ppm, C. 76 ppm, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The accepted safe level of fluoride in drinking water is 0.5 - 0.8 ppm. Deficiency of fluorine in drinking water is associated with dental caries and excess with dental and skeletal fluorosis.', 'role': 'assistant'}]