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': '45 yr old on Mtx develops respiratory symptoms? \nSelect and explain. \nA. Bacterial pneumonia, B. TB due to drug therapy, C. Nonspecific interstitial pneumonia, D. Nonspecific interstitial pneumonia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref - Harrisons internal medicine 20e', 'role': 'assistant'}]