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': 'Amount of fluoride in amalgam is \nSelect and explain. \nA. 8% SnF2, B. 10% SnF2, C. 1% NaF, D. 1% SnF2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]