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': 'All statements are true about chronic obstructive pulmonary disease; except \nSelect and explain. \nA. FEV1  < 30 of predicted value, B. FEV1/FVC < 0.7, C. Decreased Residual volume, D. Increased total lung capacity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spirometric classification of COPD severity based on post-bronchodilator FEV1', 'role': 'assistant'}]