This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'The uterus becomes pelvic organ after delivery in: \nSelect and explain. \nA. 10-12 days, B. 12-14 days, C. 14-16 days, D. 16-18 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Uterus begins to shrink in size 2 days following delivery and it becomes a pelvic organ after 2 weeks. By 6 weeks uterus regains its nonpregnant size. During involution of uterus there is no loss of myometrial cells. It occurs due to diminution of size of myometrial cells as a result of enzymatic autolysis of cytoplasm. There is augmentation of protease activity. Each myometrial cell measuring about 500-800ml in late pregnancy shrinks to less than 100ml. Ref: Donald School Manual of Practical Problems in Obstetrics edited by Narendra Malhotra page 581.', 'role': 'assistant'}]