This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (R.B.C), Subject name: Pathology
[{'content': 'Most sensitive indicator of iron deficiency anemia \nSelect and explain. \nA. Packed cell volume, B. Hemoglobin, C. Serum ferritin, D. Serum iron', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Serum ferritin(Ref: Robbins 9th/pg 649-652)Among the options provided, most sensitive marker in iron deficiency anemia is Serum ferritin.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.', 'role': 'assistant'}]