This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'Anaesthetic agent causing pain on intravenous administration \nSelect and explain. \nA. Thiopentone, B. Propofol, C. Ketamine, D. Midazolam', 'role': 'user'}, {'content': "Answer: B \nExplanation: Refer Katzung 12th/431 Propofol is highly lipid soluble It's solution is made in oil(oliy liquid employed as 1 percnt emulsion) Thus it is painful on injection", 'role': 'assistant'}]