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': 'Caries tetrad was given by: \nSelect and explain. \nA. Keyes, B. Newbrun, C. Hyatt, D. Bowen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Caries triad was given by Keyes and caries tetrad was given by Newbrun.', 'role': 'assistant'}]