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
MCHC criteria to diagnose iron deficiency anemia: 
Select and explain. 
A. <32, B. <34, C. <28, D. <30
B: <34
Answer: B: <34 
Explanation: 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.