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': 'Commonest cause of PPH is- \nSelect and explain. \nA. Uterine atony, B. Traumatic, C. Retained tissues, D. Blood coagulopathy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Uterine atony", 'role': 'assistant'}]