This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cystic fibrosis & Sleep apnea, Subject name: Medicine
Allergic Broncho-pulmonary Aspergillosis is commonly a complication of: 
Select and explain. 
A. TB, B. Bronchogenic carcinoma, C. Cystic-fibrosis, D. Wegener's granulomatosis
C: Cystic-fibrosis
Answer: C: Cystic-fibrosis 
Explanation: ABPA is a hypersensitivity reaction to A. Fumigatus and is seen in asthma and cystic fibrosis. Don't confuse with chronic pulmonary aspergillosis which is seen with TB , atypical mycobacteria , sarcoidosis and rheumatoid lung disease .