This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
[{'content': 'A 24-year-old woman underwent a normal vaginal delivery of a term infant. After the delivery, the placenta does not deliver even after 30 minutes. Which of the following would be the next step for this patient \nSelect and explain. \nA. Wait for an additional 30 minutes, B. Attempt a manual extraction of the placenta, C. Initiate oxytocin, D. Hysterectomy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: After 30 minutes, the placenta is abnormally retained, and a manual extraction is generally attempted. Waiting for another 30 minutes may lead to maternal hemorrhage, which may then lead to an indication for a hysterectomy. However, a hysterectomy would not be the initial step after 30 minutes have passed during the third stage of labor. Oxytocin should not be administered until the placenta has been delivered and the uterine fundus (when inveed) is placed back to its normal location. Oxytocin is a uterotonic agent that aids in allowing the uterus to contract down on itself in an effo to stop bleeding after the placenta has been removed.', 'role': 'assistant'}]