This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Interstitial Lung Disease, Subject name: Radiology
[{'content': '"Signet ring appearance\'- on CT is seen in- \nSelect and explain. \nA. Bronchitis, B. Bronchiectasis, C. Emplysema, D. Bronchogenic Carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]