This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Medicine
First increase of reticulocyte count occurs after how many hours of iron therapy 
Select and explain. 
A. 48 - 72 hrs, B. 24 hrs, C. 96 hrs, D. 6 hrs
A: 48 - 72 hrs
Answer: A: 48 - 72 hrs 
Explanation: Ans: a (48 - 72 hrs) Ref: OP Ghai, 6th ed, p. 302Rise in reticulocyte count occurs by 48 - 72 hrs after start of Iron therapy.Course of events after starting iron therapy :1. Child becomes less irritable and appetite improves within 24 hrs2. Bone marrow response is observed within 48 hrs3. Rise in reticulocyte count by 2nd to 3rd day4. Elevation of hemoglobin occurs next which may take upto 2 months depending on the severity of anaemiaNote:Dosage for parentral iron (iron dextran)Iron (mg) = Wt (kg) x Hb deficit (gm/dl) x 4