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
[{'content': 'Caplan syndrome is seen in \nSelect and explain. \nA. COPD, B. Pneumoconiosis, C. Pulmonary odema, D. Bronchial asthma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 17th/1625 Caplan syndrome is a combination of rheumatoid ahritis and pneumoconiosis that manifests as intrapulmonary nodules which appears homogeneous and well defined on chest X ray... It is also called as rheumatoid pneumoconiosis', 'role': 'assistant'}]