This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
A patient with a previous history of tuberculosis now complains of hemoptysis. Chest x-ray reveals an upper lobe mass with a cavity and a crescent-shaped air-fluid level. Select the most likely etiologic agent. 
Select and explain. 
A. Aspergillus flavus, B. Coccidioides immitis, C. Herpes simplex virus type 1, D. Herpes simplex virus type 2
A: Aspergillus flavus
Answer: A: Aspergillus flavus 
Explanation: The patient who has a history of tuberculosis and now complains of haemoptysis would be revaluated for active tuberculosis. However, the chest x-ray described is characteristic of a fungus ball--almost always the result of an aspergilloma growing in a previous cavitary lesion.