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: Medicine
[{'content': 'Following are true about COPD, except \nSelect and explain. \nA. Reduced FEV1, B. Increased Residual Volume, C. Decreased Diffusion capacity (DLco), D. Decreased Maximal Expiratory Flow Rate (MEFR)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: COPD is an obstructive lung disease. Obstructive diseases have reduced FEV1, FVC and reduced FEV1/FVC. Flow rates like MEFR (Maximal Expiratory Flow Rate ) are also reduced.\xa0\nDue to air-trapping, the residual volume is increased.\xa0\nReduction in DLco is seen interstitial lung diseases or pneumonias, not in COPD .\xa0\nDLco may be reduced in Emphysema due to alveolar damage.', 'role': 'assistant'}]