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: Anatomy
All the following are true about obstructive lung disease except 
Select and explain. 
A. Decreased FeV1, B. Decreased MEFR, C. Increased RV, D. Increased diffusion capacity
D: Increased diffusion capacity
Answer: D: Increased diffusion capacity 
Explanation: Diffusion capacity is decreased in restrivtive lung disease.decreased in expiratory flow rate is a hallmark of obstructive lung disease. Residual volume is increased & FEV1/FVC is decresde Ref Harrison 19th edition pg 1661