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
The drug of choice for prevention of seizures in a patient with severe preeclampsia is - 
Select and explain. 
A. Phenytoin, B. Magnesium sulphate, C. Diazepam, D. Nifedipine
B: Magnesium sulphate
Answer: B: Magnesium sulphate 
Explanation: 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.