This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutritional anemia, Subject name: Pediatrics
Which of the following is true about oral therapy for iron deficiency anemia? 
Select and explain. 
A. In 300 mg elemental iron given, 100 mg gets absorbed, B. Reticulocytosis appears in one to 2 weeks and then peaks in 3-4 weeks, C. Response to treatment stas appearing in 4 weeks, D. Decrease in absorption occurs with improvement of symptoms
D: Decrease in absorption occurs with improvement of symptoms
Answer: D: Decrease in absorption occurs with improvement of symptoms 
Explanation: Discussing about the options one by one, a. Only 10% of the iron given by oral route gets absorbed.- so option 1 is wrong b. Reticulocytosis appears in 48-72 hours, peaking at 5-7 days - so option 2 is wrong c. Clinical response to treatment appears within 24 hours - so option 3 is wrong d. The normalization of body iron store relatively decreases the iron absorption - option 4 is true TREATMENT OF IDA: - 3-6 mg/kg/ day of elemental iron in 2-3 divided closes - Maximum dose: 150-200mg of elemental Iron daily - Iron is continued for 8 weeks after blood values normalized - For IV correction, total amount of Iron needed = body weight (in kg) x (15-patient's Hb) x 2.3