This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron deficiency anemia, Subject name: Pathology
Iron absorption is increased by which of the following? 
Select and explain. 
A. Phytates, B. Tannates, C. Plant foods, D. Ascorbic acid
D: Ascorbic acid
Answer: D: Ascorbic acid 
Explanation: - Site of iron absorption - duodenum and upper jejunum (proximal small intestine). - Iron absorption is increased by Acids Ascorbic acid (Vitamin C), citric acid Amino acids containing SH-group Sugars in the diet - Phytates, Tannates (found in tea), tetracyclines & Plant foods (non-heme iron) decreases iron absorption