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': 'Popcorn calcification is seen in- \nSelect and explain. \nA. Pulmonary hamartoma, B. Pulmonary hemorrhage, C. Pulmonary teratoma, D. Pulmonary embolism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans is \'a\' i.e. Pulmonary hamartoma o Lung hamartomas# Peripheral lung masses# Composed of normal pulmonary tissue components.# More common in men than in women peak incidence in the 60s.# Often incidental radiographic findings as solitary nodules.# The have a pathognomonic "popcorn "pattern of calcification in some cases: without such a finding, resection is necessary to rule out malignancy, especially in smokers.', 'role': 'assistant'}]