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
Caplan syndrome is seen in 
Select and explain. 
A. COPD, B. Pneumoconiosis, C. Pulmonary odema, D. Bronchial asthma
B: Pneumoconiosis
Answer: B: Pneumoconiosis 
Explanation: 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