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: Medicine
Which of the following is true about oral therapy for iron deficiency anemia - 
Select and explain. 
A. In 300 mg elemental iron given100 mg get absorbed, B. Reticulocytosis appears in one to 2 weeks and then peaks in 3-4 weeks, C. Response to Rx seen in 4 weeks, D. Decrease in absorption with improvement of symptoms
D: Decrease in absorption with improvement of symptoms
Answer: D: Decrease in absorption with improvement of symptoms 
Explanation: None