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': 'MCHC criteria to diagnose iron deficiency anemia: \nSelect and explain. \nA. <32, B. <34, C. <28, D. <30', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MCHC - average concentration of hemoglobin in a given volume of packed red cells Normal MCHC is 34-37g/dl Value <34g/dl indicate that red cells are hypochromic, which can occur in iron deficiency anemia.', 'role': 'assistant'}]