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: Medicine
All are cavitating lesions in the lungs, except? 
Select and explain. 
A. Caplan's syndrome, B. Hamaoma, C. Wegner's granuloma, D. Squamous cell carcinoma
B: Hamaoma
Answer: B: Hamaoma 
Explanation: Answer is B (Hamaoma): Hamaomas produce non cavitating popcorn calcifications. Malignant lesions (squamous cell carcinoma) and granulomatous lesions (Wegener's granulomatosis, Caplan's syndrome) are established causes of cavitatory lesions.