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': 'Which of the following anaesthetic agent lacks analgesic effect – a) N2Ob) Thiopentonec) Methohexitoned) Ketaminee) Fentanyl \nSelect and explain. \nA. a, B. c, C. ac, D. bc', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Barbiturates (methexitone, thiopentone) do not have analgesic action. Rather they can cause hyperalgesia.', 'role': 'assistant'}]