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 of the following explains diagnosis of Asthma except \nSelect and explain. \nA. After administering bronchodilator FEV1 increase to > 200mL within 15 minutes, B. PEFR shows diurnal variation of >20%, C. >12% reversibility in FEV1 on administering bronchodilator, D. Diffusion Lung Capacity for carbon monoxide is decreased', 'role': 'user'}, {'content': 'Answer: D \nExplanation: DLCO is normal in Asthma.', 'role': 'assistant'}]