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
Barrel chest is usually associated with: 
Select and explain. 
A. Chronic bronchitis, B. Left heart failure, C. Anasarca, D. Perforated lung
A: Chronic bronchitis
Answer: A: Chronic bronchitis 
Explanation: None