This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following is not used in preeclampsia? \nSelect and explain. \nA. Methyldopa, B. Atenolol, C. Labetalol, D. Hydralazine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]