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 best fluoride compound recommended for mouth rinsing is: \nSelect and explain. \nA. Stannous fluoride, B. Acidulated phosphate fluoride, C. Neutral sodium fluoride, D. Ammonium fluoride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]