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': 'A young runner with history of seasonal running nose, complains of sudden onset dyspnea early morning that improved after 2-3 hours. He has history of similar episodes in the past.on examination, patient is tachypneic, diffuse polyphonic expiatory wheeze heard on auscultation of chest, His x-ray is  normal. All except one is true regarding the clinical scenario. \nSelect and explain. \nA. Diffusion Lung capacity for carbon monoxide is Normal, B. FEV1% is decreased, C. Necrosis of airways, D. Microvascular leakage resulting in airway edema.and plasma exudation into airway lumen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Clinical features are suggestive of Bronchial Asthma. There is no necrosis of airway in Bronchial Asthma.', 'role': 'assistant'}]