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': 'When a down fracture Le Fort I osteotomy is performed \nSelect and explain. \nA. necrosis is prevented by a blood supply to the maxilla from the palatine arteries, B. a patient with a cleft palate is more likely to develop necrosis, C. the operation is easier on a cleft palate patient because the lesser segment does not have to be detached from the nose, D. a tear in the nasal mucosa makes postoperative infection more likely', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]