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': 'All are true about Sodium nitroprusside except \nSelect and explain. \nA. It acts on endothelium to produce Nitric Oxide, B. Drug of choice for Hypertensive emergency, C. It is both arterial & veno-dillator, D. It can cause hypothyroidism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sodium nitroprusside is used as a second line treatment for Hypertensive emergency (DOC is Nicardipine).\nIt is a mixed vasodilator which acts on endothelium to release Nitric oxide (NO).\nIt is metabolized by liver to produce thiocyanate and may cause hypothyroidism.', 'role': 'assistant'}]