This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inhalational Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'Which inhalational anesthetic agent has analgesic effect- \nSelect and explain. \nA. Xenon, B. Desflurane, C. Isoflurane, D. Sevoflurane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Potent inhalational agent does not have analgesic effect. Carrier gases N2O and Xenon provides good analgesic.', 'role': 'assistant'}]