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': 'Drug not useful in hypertensive emergency is: \nSelect and explain. \nA. IV hydralazine, B. Indapamide, C. Sublingual nifedipine, D. Sodium nitroprusside', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]