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: Gynaecology & Obstetrics
How many weeks after delivery blood volume returns to pre-pregnant levels : 
Select and explain. 
A. 1 week, B. 2 weeks, C. 4 weeks, D. 6 weeks
B: 2 weeks
Answer: B: 2 weeks 
Explanation: Blood volume reaches prepregnant value by 1 week postpaum after delivery Cardiac Output reaches prepregnant value by 10days postpaum after delivery Reference: William's Textbook of Obstetrics 24th edition page no 690