This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Complication of 3rd Stage of Labour, Subject name: Gynaecology & Obstetrics
Commonest cause of PPH is- 
Select and explain. 
A. Uterine atony, B. Traumatic, C. Retained tissues, D. Blood coagulopathy
A: Uterine atony
Answer: A: Uterine atony 
Explanation: Ans. is 'a' i.e., Uterine atony