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
[{'content': 'Disease shown in this PFT is best characterized by \nSelect and explain. \nA. 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)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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 expi\xadratory volume in one second-forced vital ca\xadpacity (FEV1/FVC) ratio is the hallmark of obstructive, not restrictive, disease & capacity (VC) and airway resistance (Raw) are de\xadcreased in-restrictive lung disorders.', 'role': 'assistant'}]