This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
No of iron in ferritin: 
Select and explain. 
A. 4, B. 40, C. 400, D. 4000
D: 4000
Answer: D: 4000 
Explanation: Ans. D. 4000FerritinStorage Form of IronPoly nuclear complex of Hydrous ferric oxide carry about 4500 iron atomsSeen in Intestinal cells, Liver, Spleen Bone marrow Sensitive index of Body iron stores