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': 'Dietary fluoride requirement to a 12 year child with less 0.5 ppm of water FL levels will be: \nSelect and explain. \nA. 0.25 mg, B. 0.5 mg, C. 0.75 mg, D. 1.0 mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]