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': 'In Peck and Peck index, mesiodistal and buccolingual measurements of which of the following tooth is taken: \nSelect and explain. \nA. Maxillary central incisor, B. Mandibular central incisor, C. Maxillary premolars, D. Mandibular molars', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]