This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'The drug of choice to control convulsions in eclampsia is: \nSelect and explain. \nA. Pethidine, B. Diazepam, C. Magnesium sulphate, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: given by i.v. infusion, it has been used for long to control convulsions and to reduce BP in toxaemia of pregnancy. As per WHO, it is the drug of choice for prevention and treatment of seizures in preeclampsia and eclampsia. REF: KD TRIPATHI 8TH ED.', 'role': 'assistant'}]