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
Term "Clean Tooth Never Decays" given by 
Select and explain. 
A. Perrie Fauchard, B. Leon J Williams, C. Dean, D. MJ Rihanna
B: Leon J Williams
Answer: B: Leon J Williams 
Explanation: None