This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron deficiency anemia, Subject name: Pathology
[{'content': 'All are reduced in iron deficiency anemia EXCEPT: \nSelect and explain. \nA. Total iron binding capacity, B. Percentage saturation of Transferrin, C. Hemoglobin level, D. Serum ferritin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - In iron deficiency anemia as % saturation of transferrin decreases, total iron binding capacity increases. Other parameters seen in IDA are: serum ferritin | Transferrin levels | Serum iron levels | Free erythrocyte protoporphyrin ||| Mentzer index || . CBC: |Hb, MCH |, MCV |, MCHC |', 'role': 'assistant'}]