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
The most common cause of ronchopulmonary aspergillosis is - 
Select and explain. 
A. Aspergillus fumigatus, B. Aspergillus clavatus, C. Aspergillus flavus, D. Aspergillus niger
A: Aspergillus fumigatus
Answer: A: Aspergillus fumigatus 
Explanation: None