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
Commonest cause of post paum hemorrhage is: 
Select and explain. 
A. Atonic uterus, B. Traumatic, C. Combination of atonic and traumatic, D. Blood coagulation disorders
A: Atonic uterus
Answer: A: Atonic uterus 
Explanation: Atonic uterus