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': 'The first community Water Fluoridation was carried out in: \nSelect and explain. \nA. 1945, Colorado, B. 1945, Grand Rapids, C. 1945, Oak Park, D. 1945, Evanston', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]