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': 'The drug of choice for prevention of seizures in a patient with severe preeclampsia is - \nSelect and explain. \nA. Phenytoin, B. Magnesium sulphate, C. Diazepam, D. Nifedipine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Magnesium sulphate o Prevention of seizures in severe pre-eclampsia and treatment of seizures in eclampsia is done by magnesium sulphate.", 'role': 'assistant'}]