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: Gynaecology & Obstetrics
[{'content': 'Concentration of MgSO4 in the treatment of eclampsia in meq/L: \nSelect and explain. \nA. 7 − 10., B. 10 − 15., C. 2 − 4., D. 4 − 7.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]