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': 'IV administration of which anesthetic drug is most painful among the following? \nSelect and explain. \nA. Methohexital, B. Ketamine, C. Propofol, D. Etomidate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c. Propofol', 'role': 'assistant'}]