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: Pharmacology
[{'content': 'In which of the following stages general anesthesia surgery is done \nSelect and explain. \nA. Stage I, B. Stage II, C. Stage III plane 2, D. Stage III plane 3', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]