This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': "All of the following produce cavitating nodules in the lung except \nSelect and explain. \nA. Sqamous cell CA, B. Caplan's syndrome, C. Hamaoma, D. Silicosis", 'role': 'user'}, {'content': "Answer: C \nExplanation: C i.e. Hamaoma Hamaoma produces noncavitating popcorn calcificationQ. Various infections, neoplasms, granulomatous lesions (wegner's rheumatoid-caplan's, pneumoconiosis, traumatic & vascular infarcts) produce cavitatory lesions.", 'role': 'assistant'}]