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
[{'content': "All are cavitating lesions in the lungs, except \nSelect and explain. \nA. Caplan's syndrome, B. Hamartoma, C. Wegner's granuloma, D. Squamous cell carcinoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]