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': 'Which of the following agents is not used to provide induced hypotension during surgery ? \nSelect and explain. \nA. Sodium nitroprusside, B. Hydralazine, C. Mephenteramine, D. Esmolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Drugs used for controlled (induced hypotension) :- Nitroprusside, Nitroglycerine, Hydralazine, β-blockers (esmolol), adenosine, fenoldopam, volatile anesthetics.', 'role': 'assistant'}]