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: Physiology
Differential white blood cell counts in the laboratory are useful in the diagnosis of: 
Select and explain. 
A. Anemia, B. Eosinophilia, C. Vitamin deficiency, D. Spherocytosis
B: Eosinophilia
Answer: B: Eosinophilia 
Explanation: None