**Core Concept**
Caplan's syndrome is a rare condition characterized by the combination of rheumatoid arthritis, pneumoconiosis, and intrapulmonary nodules. It is an occupational lung disease, typically seen in miners. The underlying principle involves the interplay of chronic inflammation and environmental exposure.

**Why the Correct Answer is Right**
The correct answer is related to the occupational exposure of miners, which increases their risk of developing pneumoconiosis. Rheumatoid arthritis and pneumoconiosis can coexist, leading to the formation of intrapulmonary nodules. The specific answer choice that corresponds to this condition is the one that mentions miners or a similar occupational group.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not relate to the occupational exposure associated with Caplan's syndrome.
**Option B:** Similarly, this option does not correspond to the condition, as it lacks the connection to pneumoconiosis and rheumatoid arthritis.
**Option C:** This choice is also incorrect, as it does not accurately represent the condition.

**Clinical Pearl / High-Yield Fact**
Caplan's syndrome is a memorable condition due to its unique combination of rheumatoid arthritis and pneumoconiosis. It serves as a reminder of the importance of occupational history in diagnosing lung diseases.

**Correct Answer:** D. Miners with rheumatoid arthritis.