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: Surgery
The most common benign tumor of the lung is ? 
Select and explain. 
A. Hamaoma, B. Alveolar adenoma, C. Teratoma, D. Fibroma
A: Hamaoma
Answer: A: Hamaoma 
Explanation: Ans. is 'a' i.e., Hamaoma