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': 'Floating maxilla is a typical feature of the following fracture: \nSelect and explain. \nA. Lefort 1, B. Lefort 2, C. Lefort 3., D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]