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': 'The minimum acceptable value for a hematocrit for elective oral surgery is: \nSelect and explain. \nA. 11, B. 18, C. 23, D. 30', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]