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
Most common cause of postpartum hemorrhage is: 
Select and explain. 
A. Uterine atony, B. Retained products, C. Trauma, D. Bleeding disorders
A: Uterine atony
Answer: A: Uterine atony 
Explanation: Ans. is a, i.e. Uterine atonyRef Dutta Obs. 7/e, p 410Most common cause of PPH or primary PPH is Atonic uterusMost common cause of secondary PPH is retained placenta