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': 'Ramu, a 3 year 8 month old child is living in an area where fluoride water supply  consists of 0.4 ppm. Fluoride supplement needed is \nSelect and explain. \nA. 0.15 mg, B. 0.25 mg, C. 0.50 mg, D. 1.0 mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dietary Fluoride Supplementation Schedule', 'role': 'assistant'}]