## Core Concept
Rheumatoid arthritis (RA) is a chronic autoimmune disorder primarily affecting joints, characterized by inflammation, pain, swelling, and potentially leading to severe joint damage and deformity. The pathophysiology involves an interplay of genetic and environmental factors, leading to an abnormal immune response. Key features include symmetric joint involvement, morning stiffness, and the presence of rheumatoid factor (RF) and anti-citrullinated protein antibodies (anti-CCP).

## Why the Correct Answer is Right
The correct answer isn't directly provided, but we'll assess each option based on known facts about RA.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, RA is characterized by morning stiffness lasting more than an hour, which is a hallmark symptom. So, any statement contradicting this well-established fact would be incorrect.
- **Option B:** Rheumatoid arthritis often presents with symmetric joint involvement, commonly affecting hands, feet, wrists, and knees. An option stating RA typically affects joints asymmetrically would be incorrect.
- **Option C:** The presence of RF and anti-CCP antibodies is a diagnostic criterion for RA. These are considered specific markers, though not all patients test positive for them. An option denying the association of these antibodies with RA would be incorrect.
- **Option D:** Without the specific details of option D, we consider common misconceptions: RA can indeed have systemic manifestations, including lung involvement (e.g., interstitial lung disease), making an option that suggests RA only affects joints without any systemic involvement incorrect.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that early diagnosis and treatment of RA can significantly alter the disease course, reducing joint damage and improving quality of life. The 2010 ACR/EULAR classification criteria for RA emphasize the importance of early identification, incorporating clinical (swollen joints, duration of symptoms) and serological factors (RF, anti-CCP).

## Correct Answer: D. Extra-articular manifestations are not seen.