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': 'During the removal of a torus palatinus it was notice that a portion of palatal of bone is fractured. One would expect: \nSelect and explain. \nA. An opening into the nasal cavity, B. An opening into the maxillary antrum, C. Vertical fracture of maxilla, D. Horizontal fracture of maxilla', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]