This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Post Paum Haemorrhage (This better stop now !), Subject name: Gynaecology & Obstetrics
[{'content': 'Which one of the following is not a cause of secondary postpaum hemorrhage? \nSelect and explain. \nA. Placenta pre, B. Retained bits of placenta, C. von Willebrand disease, D. Placental polyp', 'role': 'user'}, {'content': "Answer: A \nExplanation: - Placenta pre causes APH Secondary postpaum hemorrhage is bleeding after 24 hours to 12 weeks after delivery. Causes of PPH : Uterine atonicity ( most common cause of primary PPH) Injury to any pa of genital tract Coagulopathy (von Willebrand's disease) Retained tissues - (most common cause of secondary PPH ) Usually, retained products undergo necrosis with fibrin deposition and may eventually form a so-called placental polyp.", 'role': 'assistant'}]