This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sarcoidosis, Subject name: Pathology
Caplan's syndrome is seen in: 
Select and explain. 
A. COPD, B. Pneumoconiosis, C. Pulmonary edema, D. Bronchial asthma
B: Pneumoconiosis
Answer: B: Pneumoconiosis 
Explanation: Caplan's syndrome is a combination of rheumatoid ahritis (RA)and pneumoconiosis that manifests as intrapulmonary nodules, which appear homogenous and well-defined on chest X-ray. -When a person with rheumatoid ahritis is exposed to such offensive materials, they are at an increased risk of developing pneumoconiosis.