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': 'Paogram helps in detecting \nSelect and explain. \nA. Abruptio placenta, B. Obstructed labour, C. Incoordinate uterine action, D. PPH', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Obstructed labour', 'role': 'assistant'}]