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
Causes of antepaum hemorrhage are all except 
Select and explain. 
A. Placenta pre, B. Atonic uterus, C. Abruptio placenta, D. Circumvallate placenta
B: Atonic uterus
Answer: B: Atonic uterus 
Explanation: Atonic uterus