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
Concentration of F in 1.23% APF gel is (1.23% c) 
Select and explain. 
A. 22600 ppm, B. 12300 ppm, C. 5620 ppm, D. None
B: 12300 ppm
Answer: B: 12300 ppm 
Explanation: None