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
The fluoride concentration in 8% stannous fluoride, topical application, is 
Select and explain. 
A. 1000 ppm, B. 9200 ppm, C. 19500 ppm, D. 12300 ppm
C: 19500 ppm
Answer: C: 19500 ppm 
Explanation: None