This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Drug of choice for Hypeension in eclampsia is \nSelect and explain. \nA. Magnesium Sulphate, B. Nifedipine, C. Hydralizine, D. Labetolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer kDT 7/e p 573 The drug of choice to treat and preventeclampsia is magnesium sulfate. Familiarity with second-line medications phenytoin and diazepam/lorazepam is required for cases in which magnesium sulfate may be contraindicated (eg, myasthenia gravis) or ineffective.', 'role': 'assistant'}]