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': 'Pop corn calcification is a characteristic of \nSelect and explain. \nA. Sarcoidosis, B. TB, C. Pulmonary hamartoma, D. Metastasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pop corn calcification is characteristic of pulmonary hamartoma.', 'role': 'assistant'}]