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: Pathology
The following are recognized causes of neutropenia EXCEPT 
Select and explain. 
A. Corticosteroid therapy, B. Typhoid fever, C. Aplastic anemia, D. Viral infection
A: Corticosteroid therapy
Answer: A: Corticosteroid therapy 
Explanation: None