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: Anatomy
[{'content': 'Atonic uterus is more common in : \nSelect and explain. \nA. Cesarean section, B. Multigravida, C. Primigravida, D. Breech delivery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Multigravida leads to postpaum hemorrhage due to laxed abdomen Inadequate retraction and frequent adherent placenta contribute to it. Ref: Datta Obs 9e pg 385.', 'role': 'assistant'}]