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': 'Pain is caused by injection of ? \nSelect and explain. \nA. Ketamine, B. Methohexitone, C. Di-isopropyl Alcohol, D. Thiopentonc', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Thiopentone o Inadevent intraerial injection or extravastion of thiopentone produces intense pain - necrosis and gangrene may occur. o Inducing agents producing pain on injection (Miller 6`1'/e) 1. Thiopentone 2. Propofol 3. Etomidate 4. Methohexitone", 'role': 'assistant'}]