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
The most impoant cause of the coagulation failure in obstetrics is : 
Select and explain. 
A. Intrauterine fetal death, B. Accidental hemorrhage, C. Placenta pre, D. Rupture of the uterus
B: Accidental hemorrhage
Answer: B: Accidental hemorrhage 
Explanation: Accidental hemorrhage