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: Unknown
Disease shown in this PFT is best characterized by 
Select and explain. 
A. Low lung volumes, B. A decrease in the l-second forced expiratory volume-forced vital capacity (FEV1/FVC) ratio, C. An increased vital capacity (VC), D. A decreased diffusing capacity DLCO)
A: Low lung volumes
Answer: A: Low lung volumes 
Explanation: Restrictive disorders are characterized by low lung volumes. Diffusing capacity (DLCO) may or not be decreased in pulmonary fibrosis), a type of restrictive disease. A decrease in the forced expi­ratory volume in one second-forced vital ca­pacity (FEV1/FVC) ratio is the hallmark of obstructive, not restrictive, disease & capacity (VC) and airway resistance (Raw) are de­creased in-restrictive lung disorders.