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': 'Highest analgesic effect is a feature of - \nSelect and explain. \nA. Ketamine, B. Thiopentone, C. Propofol, D. Ethomidate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Ketamine "Ketamine is different from most other anaesthetic induction agents in that it has significant analgesic action". Remember o Amongst inhalation agents trilene (maximum), NO and ether have good analgesic action.', 'role': 'assistant'}]