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
Post paum hemorrhage in a spontaneous delivery is commonly due to: September 2005, March 2013 
Select and explain. 
A. Traumatic, B. Uterine atony, C. Blood coagulopathy, D. Mixed causes
B: Uterine atony
Answer: B: Uterine atony 
Explanation: Ans. B: Uterine Atony Atonic uterus is the most common cause of PPH (80%) followed by traumatic (20%)