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
Which of these best defines puerperium: 
Select and explain. 
A. 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
A: A period of 6 weeks following expulsion of placenta
Answer: A: A period of 6 weeks following expulsion of placenta 
Explanation: 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