This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
All are cavitating lesions in the lung except 
Select and explain. 
A. Caplan's syndrome, B. Hamaoma, C. Wegner's granulomatosis, D. Squamous cell carcinoma
B: Hamaoma
Answer: B: Hamaoma 
Explanation: Ref Harrison 19 th ed pg 1794 Hamaomas produce non cavitating popcorn calcifications.