This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Most common cause of secondary PPH is : 
Select and explain. 
A. Uterine ineia, B. Retained placenta, C. Episiotomy, D. Cervical tear
B: Retained placenta
Answer: B: Retained placenta 
Explanation: Retained placenta Secondary PPH Bleeding usually occurs between 8th to 14th day of delivery. Causes of late PPH : Retained bits of cotyledon or membranes (M.C.) Infection and separation of slough over a deep cervico - vaginal laceration. Endometritis and subinvolution of the placental site Ref : Dutta book of obstetrics 8th Ed.