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': 'Maximum analgesic action found in – \nSelect and explain. \nA. Catecholamine, B. Propofol, C. Ketamine, D. Thiopentone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ketamine is different from most other anaesthetic induction agents in that it has significant analgesic action.', 'role': 'assistant'}]