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 postpaum hemorrhage In multipara is: 
Select and explain. 
A. Fibroid, B. Retained placenta, C. Uterine atony, D. Uterine perforation
C: Uterine atony
Answer: C: Uterine atony 
Explanation: Uterine atony