This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstructive Lung Disease, Subject name: Pathology
[{'content': 'Bronchus is the site of pathological changes for all of the following diseases, except: \nSelect and explain. \nA. Chronic bronchitis, B. Asthma, C. Bronchiectasis, D. Emphysema', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Emphysema occurs at the site of acinus, the anatomical site for the rest of them is the bronchus.', 'role': 'assistant'}]