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
All are true about Interstitial Fibrosis, Except 
Select and explain. 
A. FVC < 80% Predicted, B. FEV 1 /FVC < 0.7, C. DLCO is decreased, D. TLC is decreased
B: FEV 1 /FVC < 0.7
Answer: B: FEV 1 /FVC < 0.7 
Explanation: Answer is B (FEV1/FVC < 0.7): Interstitial lung disease like interstiul fibrosis are characterized by a normal or elevated FEV IFVC ratio which is characteristically> 0.7. PFT results comparing obstructive and restrictive disease (may not be applicable for all forms of lung (disease) FEVI=foreed expiratory volume in one second; FVC=Forced Vital Capacity; FEF25_75=Foreed Expiratory Flow at 25%=75% vital capacity; TLC= Total Lung Capacity; DLCO=Diffusion Capacity of the Lung for Carbon monoxide.