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
[{'content': 'The following are recognized causes of neutropenia EXCEPT \nSelect and explain. \nA. Corticosteroid therapy, B. Typhoid fever, C. Aplastic anemia, D. Viral infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]