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: Microbiology
Most important risk factor for invasive aspergillosis are 
Select and explain. 
A. Profound neutropenia, B. Tuberculosis, C. Glucocorticoid use, D. Antitumor necrosis factor therapy
C: Glucocorticoid use
Answer: C: Glucocorticoid use 
Explanation: All of above are risk factors. But most important is Glucocorticoid use.