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': 'The capacity of balloon tamponade to arrest PPH is around __________ \nSelect and explain. \nA. 100-300 ml, B. 300-500 ml, C. 500-700 ml, D. 650-850 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The capacity of balloon tamponade to arrest PPH is around 300-500 ml. A Bakri postpaum Balloon may be inseed and inflated to tamponade the endometrial cavity and stop bleeding. Inseion requires two or three team members. One to perform abdominal sonography during the procedure. Another to place the deflated balloon into the uterus and stabilize it. The third member instills fulid to inflate the balloon, rapidly infusing at least 150 ml followed by fuher instillation over a few minutes for a total of 300 to 500 ml to arrest hemorrhage. Ref: Williams Obstetrics 24th edition Pgno: 786', 'role': 'assistant'}]