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': 'With oral iron therapy, rise in Hb% can be seen after: \nSelect and explain. \nA. 1 week, B. 3 weeks, C. 4 weeks, D. 6 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rise in hemoglobin with oral iron – 0.7 gm-1 gm per week, which is seen after 3 weeks of initiation of oral therapy.\n(According to COGDT, 10/ed, p 407 — Hemoglobin levels should increase by atleast 0.3g/dl/week if the patient is responding to therapy)\nIf there is no significant clinical or hematological improvement within 3 weeks, diagnostic re-evaluation is needed.', 'role': 'assistant'}]