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': 'The largest permanent tooth in the mouth usually is: \nSelect and explain. \nA. Maxillary canine, B. Mandibular canine, C. Mandibular first molar, D. Maxillary first molar', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]