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': "Four dentists did study model analysis by Johnson and Tanaka; Moyer's, Stanley and Kerber, Wits analysis. Which one will give the best results: \nSelect and explain. \nA. Johnson and Tanaka, B. Moyers, C. Stanley and Kerber, D. Wits", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]