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': 'During community water fluoridation which of the following is least important? \nSelect and explain. \nA. Temperature of the area, B. Geographical location of the area, C. Physiological response to fluoride, D. Average weight of children', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]