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: Anaesthesia
[{'content': 'Best anaesthetic agent for out patient anasthesia is \nSelect and explain. \nA. Fentanyl, B. Morphine, C. Alfentanyl, D. Penthidine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Alfentanyl', 'role': 'assistant'}]