This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
Pulmonary function abnormalities in interstitial lung diseases include all of the following except 
Select and explain. 
A. Reduced vital capacity, B. Reduced FEV1 /FVC ratio, C. Reduced diffusion capacity, D. Reduced total lung capacity
B: Reduced FEV1 /FVC ratio
Answer: B: Reduced FEV1 /FVC ratio 
Explanation: A group of disorders that cause progressive scarring of lung tissue. Interstitial lung disease may be caused by long-term exposure to hazardous materials, such as asbestos or coal dust, or it can be caused by an auto-immune disease such as rheumatoid ahritis. Once lung scarring occurs, it's generally irreversible. Ref: guyton and hall textbook of medical physiology 12 edition page number:327,328,329