This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
All of the following are causes of secondary postpaum hemorrhage except: 
Select and explain. 
A. Retained cotyledon, B. Endometritis, C. Placental polyp, D. Placenta pre
D: Placenta pre
Answer: D: Placenta pre 
Explanation: Postpaum hemorrhage (PPH) occuring in the first 24 hrs after delivery is called primary or early PPH, and placenta pre causes early/Primary PPH. It is also a primary cause of antepaum hemorrhage. Secondary postpaum hemorrhage (late PPH): It is defined as bleeding 24 hours to 12 weeks after delivery. Causes: Abnormal involution of the placental site. Retention of placental cotyledon or products of conception. Placental polyp: Retained products undergo necrosis with fibrin deposition and eventually form a placental polyp, which on detachment from the myometrium causes of brisk hemorrhage. Placenta accreta Uterine aery pseudoaneurysm Endometritis Coagulopathy Ref: Williams Obstetrics 24th edition Pgno: 670, 671