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: Dental
[{'content': 'Community water fluoridation is important because \nSelect and explain. \nA. All groups of socio economic status have accessibility to it, B. Does not pose a health hazard, C. Leads to decrease in the dental caries incidence, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]