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Question 33What is the most common cause of primary postpartum hemorrhage?A) Uterine atonyB) Retained placentaC) Genital tract traumaD) Coagulation disordersE) Uterine inversionAnswer: A) Uterine atonyExplanation: Uterine atony, the failure of the uterus to contract effectively after delivery, is the most common cause of primary postpartum hemorrhage, accounting for about 70% of cases.