This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': "Caplan's syndrome is? \nSelect and explain. \nA. Pneumoconiosis with lymphadenopathy, B. Pneumoconiosis with CCF, C. Pneumoconiosis with HIV, D. Pneumoconiosis with rheumatoid arthritis", 'role': 'user'}, {'content': "Answer: D \nExplanation: ANSWER: (D) Pneumoconiosis with rheumatoid arthritisREF: Harrison's 17th ed chapter 314'Caplan's syndrome first described in coal miners but subsequently found in patients with silicosis, includes seropositive rheumatoid arthritis with characteristic pneumoconiotic nodules''", 'role': 'assistant'}]