This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: COPD and Asthma, Subject name: Medicine
What is false about emphysema? 
Select and explain. 
A. Decreased FEV1, B. Decreased timed vital capacity, C. Increased residual volume, D. Increased diffusion capacity
D: Increased diffusion capacity
Answer: D: Increased diffusion capacity 
Explanation: Increased diffusion capacity is seen in: Acute congestive hea failure Polycythemia Pulmonary hemorrhage / good pasture syndrome Asthma Decreased diffusion capacity is seen in: Pulmonary fibrosis Emphysema Pulmonary hypeension