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
Which among the following is true about Caplan's syndrome? 
Select and explain. 
A. Pneumoconiosis with lymphadenopathy, B. Pneumoconiosis with CCF, C. Pneumoconiosis with HIV, D. Pneumoconiosis with rheumatoid ahritis
D: Pneumoconiosis with rheumatoid ahritis
Answer: D: Pneumoconiosis with rheumatoid ahritis 
Explanation: Caplan's syndrome also known as rheumatoid pneumoconiosis or rheumatoid lung. It occurs in patients with both rheumatoid ahritis (usually seropositive patients) and pneumoconiosis related to mining dust (coal, asbestos, and silica) exposure and consists of multiple rounded nodules in the lung. Ref: Harrison's 17th ed chapter 314 ; Rheumatology and Immunology Therapy: A to Z Essentials edited by Larry W. Moreland, 2004, Page 186.