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': 'Well defined lesion in the lung with popcorn calcification on X-ray suggestive of- \nSelect and explain. \nA. Ca lung, B. Adenoma, C. Hamartoma, D. Hydatid cyst', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Popcorn calcification is characteristic of Hamartoma.', 'role': 'assistant'}]