This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
All are impoant laboratory features of hereditary spherocytosis, EXCEPT: 
Select and explain. 
A. Reduced MCHC, B. Normocytic anemia, C. Positive pink test, D. Normal WBC count
A: Reduced MCHC
Answer: A: Reduced MCHC 
Explanation: Laboratory diagnosis of hereditary spherocytosis The anemia is usually normocytic. Increase in mean corpuscular hemoglobin concentration (MCHC)- (The only condition in which an increased MCHC is seen.) The diagnosis is on the basis of red cell morphology and osmotic fragility, a modified version called the pink test. Ref: Harrison, E-18, P-875.