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
[{'content': 'Best test for assessment of iron status is: \nSelect and explain. \nA. Transferrin, B. Ferritin, C. Serum iron, D. Hemoglobin', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Ferritin(Ref: Nelson's 20/e p 2323-2325, Ghai 8/e p 334-335)Serum ferritin level indicates the amount of iron present in both liver and reticuloendothelial system and hence is the best assessment of iron status.", 'role': 'assistant'}]