This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Management and Long-Term Consequences, Subject name: Gynaecology & Obstetrics
[{'content': 'Drug of choice for eclampsia is? \nSelect and explain. \nA. Magnesium sulphate, B. Clonazepam, C. Antihypertensives, D. Beta blockers', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Magnesium sulphateRef: William's 22nd ed ch-34y Current Diagnosis & Treatment Obstetrics & Gynecology lOthed Table 19-2f Table 19-4y Danforth 1 Othed p-264", 'role': 'assistant'}]