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
[{'content': 'What is false about emphysema? \nSelect and explain. \nA. Decreased FEV1, B. Decreased timed vital capacity, C. Increased residual volume, D. Increased diffusion capacity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]