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': 'If severe bony undercut exist, best treatment \nSelect and explain. \nA. Remove both undercut so that no undercut exists, B. Remove undercut on one side, C. Nothing but do only alveolar ridge contouring, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]