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': 'Concentration of F in 1.23% APF gel is (1.23% c) \nSelect and explain. \nA. 22600 ppm, B. 12300 ppm, C. 5620 ppm, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]