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': 'Pain during injection occurs with all except – \nSelect and explain. \nA. Propofol, B. Thiopentone, C. Ketamine, D. Etomidate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ketamine is the only intravenous inducing agent that does not cause pain on injection.', 'role': 'assistant'}]