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
Amount of elemental iron required for iron replacement therapy ? 
Select and explain. 
A. 60 mg of elemental iron per day, B. 160 mg of elemental iron per day, C. 300 mg of elemental iron per day, D. 360 mg of elemental iron per day
C: 300 mg of elemental iron per day
Answer: C: 300 mg of elemental iron per day 
Explanation: Typically for iron replacement therapy, up to 300 mg of elemental iron per day is needed, usually as three or four iron tablets (each containing 50-65 mg elemental iron) per day. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 848