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 fluorosis index was given by \nSelect and explain. \nA. Mc kay, B. Jackson, C. Dean, D. Black G.V.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]