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
Most likely diagnosis ? 
Select and explain. 
A. Interstitial lung disease, B. Pulmonary aery hypeension, C. Congestive hea failure, D. Bronchiectasis
B: Pulmonary aery hypeension
Answer: B: Pulmonary aery hypeension 
Explanation: 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.