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': 'The average blood loss in normal delivery is: September 2009 \nSelect and explain. \nA. 250 ml, B. 500 ml, C. 750 ml, D. 1000 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: 500 ml The average blood loss at the time of delivery is approximately 500 cc during a vaginal delivery and approximately 1,060 cc during a cesarean section. Excessive blood loss or "postpaum hemorrhage" complicates approximately 4% of vaginal deliveries and 6-7% of cesarean sections.', 'role': 'assistant'}]