This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
[{'content': 'A 53-year-old man presents for evaluation of progressive shortness of breath. His symptoms are insidious in onset and he reports no cough, sputum, or chest discomfort. His past medical history is significant for well-controlled hypertension and type 2 diabetes. He is a lifetime nonsmoker and has no history of occupational exposure to inhaled organic or inorganic particles. Pulmonary function tests reveal a restrictive defect, and a high-resolution CT suggests pulmonary fibrosis. Which of the following is the most likely role of transbronchial biopsy in this condition? \nSelect and explain. \nA. assess disease severity, B. assess possible bronchiolar narrowing, C. diagnose specific causes of interstitial lung disease, D. determine degree of inflammation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Transbronchial biopsy helps differentiate idiopathic pulmonary fibrosis (IPF) from similar syndromes with specific treatments. These include chronic hypersensitivity pneumonitis, cryptogenic organizing pneumonia, and sarcoidosis.', 'role': 'assistant'}]