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': 'The\tdrug\tcombination\twhich\tproduces\nNeuroleptanalgesia is \nSelect and explain. \nA. Daroperidol + Fentanyl, B. Droperidol + Ketamine, C. Droperiodl + Ether, D. Droperiodl + Thiopental sodium + Nitrous oxide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]