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 stores are best indicated by: 
Select and explain. 
A. S. ferritin, B. S. Iron, C. S. Transferrin, D. TIBC
A: S. ferritin
Answer: A: S. ferritin 
Explanation: a. S. ferritin(Ref: Nelson's 20/e p 2323-2325, Ghai 8/e p 334-335)Serum ferritin reflects the storage of Iron which is decreased even in the pre-latent stage of Iron deficiency Anemia and is the most sensitive marker.