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
Pop-corn calcification is seen with? 
Select and explain. 
A. Pulmonary Hamartoma, B. Aspergillosis, C. Broncho-Alveolar cancer, D. Pulmonary Embolism
A: Pulmonary Hamartoma
Answer: A: Pulmonary Hamartoma 
Explanation: Ans. (a) Pulmonary HamartomaRef: Harrison 19th ed. / 515-16* Popcorn calcification is virtually diagnostic on chest radiographs for pulmonary hamartoma.* It characteristically appears as well-defined, solitary pulmonary nodules; they may show varying patterns of calcification, including an irregular popcorn, stippled, or curvilinear pattern, or even a combination of all 3 patterns..