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
Well defined rounded opacity is the lung with cause irregular calcification is a feature of: 
Select and explain. 
A. Hamaoma, B. Hydatid cyst, C. Amoebic abscess, D. Ca lung
A: Hamaoma
Answer: A: Hamaoma 
Explanation: Ans. Hamaoma