This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following drug is contraindicated to control atonic hemorrhage in a preeclamptic woman? \nSelect and explain. \nA. Oxytocin, B. Misoprostol, C. Methylergonovine, D. PGF2 alfa', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ergot agents , especially given intravenously, may cause dangerous hypeension, especially in women with preeclampsia. Given parenterally, these drugs rapidly stimulate tetanic uterine contractions and act for approximately 45 minutes.These are used as second line agents after oxytocin to control atonic bleeding.Ref: William's Obstetrics; 25th edition", 'role': 'assistant'}]