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': 'Who gave the concept of "Clean tooth never Decays"? \nSelect and explain. \nA. Pierre fauchard, B. Leon Williams, C. Rihanna, D. Dean', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]