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: Surgery
[{'content': 'The extraction of which of the following is most\ndifficult in maxillary arch \nSelect and explain. \nA. Lateral incisor, B. First premolar, C. Second premolar, D. Canine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]