This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Interstitial Lung Disease, Subject name: Medicine
Curve A signifies which of the following? 
Select and explain. 
A. Pulmonary fibrosis, B. Atelectasis, C. Emphysema, D. ARDS
C: Emphysema
Answer: C: Emphysema 
Explanation: Curve A - increased in Emphysema Curve B - normal Curve C--> decreased in pulmonary fibrosis