This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Iron absorption is increased by: 
Select and explain. 
A. Phytates, B. Tannates, C. Plant food, D. Ascorbic acid
D: Ascorbic acid
Answer: D: Ascorbic acid 
Explanation: d. Ascorbic acid(Ref: Nelson's 20/e p 2323-2325, Ghai 8/e p 334-335)Iron Absorption* Site of iron absorption: duodenum and upper jejunum; Ferrous form (Fe2+) of iron is absorbedQ* Transport of (Fe2+) into enterocyte occurs via DMT1Q Increased byDecreased by* Acids e.g. ascorbic acid (Vitamin C)Q* Amino acid containing SH-group* Alkalies* Phosphates and PhytatesQ* Tetracycline* Presence of other food in stomach