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': 'Commonly encountered complication during extraction of maxillary third molar is \nSelect and explain. \nA. Oro-antral communication, B. Root displacement into sinus, C. Excessive hemorrhage, D. Fracture of the maxillary tuberosity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]