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': "A 45-year-old coal mine worker presents with cutaneous nodules, joint pain and occasional cough with dyspnea. His chest radiograph shows multiple small (1-4 cm) nodules in bilateral lung fields. Some of the nodules show cavitation and specks of calcification. Most likely these features are diagnostic of - \nSelect and explain. \nA. Sjogrens syndrome, B. Caplan's syndrome, C. Silicosis, D. Wegener's granulomatosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]