This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Puerperium, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of these best defines puerperium: \nSelect and explain. \nA. A period of 6 weeks following expulsion of placenta, B. A period after 6 weeks of delivery upto 12 weeks, C. A period of 24 hrs after delivery, D. The entire peripaum period upto 6 weeks following childbih', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Puerperium begins as soon as the placenta is expelled and lasts for approximately 6 weeks when the uterus and all other pelvic organs regress back almost to the non-pregnant size and function', 'role': 'assistant'}]