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 most posterior teeth are removed \nSelect and explain. \nA. Least, B. Maximal, C. Last, D. First', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]