This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'Most likely diagnosis ? \nSelect and explain. \nA. Interstitial lung disease, B. Pulmonary aery hypeension, C. Congestive hea failure, D. Bronchiectasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CT scan of chest showing enlarged pulmonary aeries In interstitial lung diseases HRCT shows bilateral subpleural reticular changes,with traction bronchiectasis and honeycombing(idiopathic pulmonary fibrosis).and varies according to cause of ILD. In bronchiectasis CT shows: tram tracts and signet ring sign.', 'role': 'assistant'}]