This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
With oral iron therapy, rise in hb% can be seen after 
Select and explain. 
A. 1 week, B. 3 weeks, C. 4 weeks, D. 6 weeks
B: 3 weeks
Answer: B: 3 weeks 
Explanation: The improvement should be evident within 3 weeks of the therapy. After a lapse of few days, the hemoglobin concentration is expected to rise at the rate of about 0.7 gm/100 mL per week. Reference: Textbook of Obstetrics; Sheila Balakrishnan; 2nd Edition; Page no: 287