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': 'Of the following permanent teeth, which is least likely to have two roots? \nSelect and explain. \nA. Maxillary canine, B. Mandibular canine, C. Maxillary first premolar, D. Mandibular first premolar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]