This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
[{'content': 'Which of the following drug is safe in pregnancy? \nSelect and explain. \nA. Sodium nitroprusside, B. Hydralazine, C. ACE inhibitors, D. Indapamide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. HydralazineSafe antihypertensive in pregnancy - beta blockers (labetalol), methyl dopa, clonidine, nifedipine, hydralazine, prazosin.', 'role': 'assistant'}]