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 permanent anterior tooth, which is most commonly atypical, is: \nSelect and explain. \nA. Maxillary central incisor, B. Maxillary lateral incisor, C. Mandibular central incisor, D. Mandibular 1st premolar', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]