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': 'Displacement of a root into the maxillary sinus\nduring extraction is most likely to happen during the extraction of the maxillary \nSelect and explain. \nA. Canine, B. Deciduous first molar, C. First molar, D. Second molar', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]