Rheumatoid arthritis is best classified as:
ABacterial infection
BGenetic disorder
CAuto-immune disease — body attacks its own self-cells
DCancer
Answer & Solution
Correct answer: C. Auto-immune disease — body attacks its own self-cells
**Rheumatoid arthritis** = autoimmune disease. The immune system mistakenly attacks the body's own joint tissue. NCERT explicitly cites it as an example of autoimmunity (alongside SLE, MS, etc.).
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