This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
[{'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: <p>In the development of anemia , firstly storage iron(ferritin) depletion occurs during which iron reserves are lost without compromise of the iron supply for erythropoiesis. So it is the best test for assessment of iron status .</p><p>Reference :Harsh mohan textbook of pathology sixth edition pg no 299 </p>', 'role': 'assistant'}]