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 most impoant cause of the coagulation failure in obstetrics is : \nSelect and explain. \nA. Intrauterine fetal death, B. Accidental hemorrhage, C. Placenta pre, D. Rupture of the uterus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Accidental hemorrhage', 'role': 'assistant'}]