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
[{'content': 'Most common cause of postpartum hemorrhage is: \nSelect and explain. \nA. Uterine atony, B. Retained products, C. Trauma, D. Bleeding disorders', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]