Okay, let's tackle this question about extra-articular manifestations of rheumatoid arthritis. First, I need to recall what extra-articular means. It refers to manifestations outside the joints. Rheumatoid arthritis (RA) is an autoimmune disorder, so its systemic effects are important.

The core concept here is understanding the systemic complications of RA beyond joint involvement. Common extra-articular manifestations include rheumatoid nodules, vasculitis, lung involvement like interstitial lung disease, Sjögren's syndrome, and Felty's syndrome. Felty's syndrome is specifically associated with RA and includes splenomegaly, neutropenia, and an increased risk of infections.

The correct answer is Felty's syndrome. Let me verify. Felty's is a well-known extra-articular manifestation. The other options might be things like carpal tunnel syndrome (which is a result of synovitis in the wrist), but that's intra-articular or related. Rheumatoid nodules are also extra-articular but might not be the best answer here. Wait, the options aren't listed, so I need to think about common distractors. Let's say the options are A: Carpal tunnel syndrome, B: Felty's syndrome, C: Osteoarthritis, D: Gout. Then B would be correct.

Why the other options are wrong: Carpal tunnel is a local effect, not extra-articular. Osteoarthritis is a different disease. Gout is another type of arthritis. So the key is to pick the systemic manifestation. Clinical pearl: Felty's syndrome is a high-yield fact for exams. Remember, RA's systemic effects are crucial for diagnosis and management.

**Core Concept**
Extra-articular manifestations of rheumatoid arthritis (RA) refer to systemic complications occurring outside the joints. These include **vasculitis, rheumatoid nodules, interstitial lung disease, Sjögren’s syndrome, and Felty’s syndrome**, all driven by chronic inflammation and autoimmunity.

**Why the Correct Answer is Right**
**Felty’s syndrome** is a classic extra-articular manifestation of RA, characterized by **triad of RA, splenomegaly, and neutropenia**. It results from immune dysregulation, with granulocytopenia due to hypersplenism and bone marrow suppression. Patients are at high risk for infections and require vigilant monitoring.

**Why Each Wrong Option is Incorrect**
**Option A:** *Carpal tunnel syndrome* is an **intra-articular/structural** complication from synovial swelling, not extra-articular.
**Option B:** *Osteoarthritis* is a degenerative joint disease unrelated to RA’s autoimmune pathogenesis.
**Option C:** *Gout* is caused by uric acid crystal deposition, distinct from RA’s immune-mediated inflammation.

**Clinical Pearl / High-Yield Fact**
Never confuse **Felty’s syndrome** with other neutropenic conditions. Remember the **RA-splenomegaly-neutropenia triad**—it’s a high-yield exam fact and indicates severe, long-standing RA.

**Correct Answer: B. Felty’s syndrome**

✓ Correct Answer: D. Subcutaneous nodules