A 36-year-old woman presents with pain, aching, stiffness, and swelling in her hands for 6 months. She reports a family history of rheumatoid arthritis (RA). Which of the following most closely describes the pathophysiology of RA?

Choice A reason: RA is not caused by bacterial infection. It is an autoimmune disease where the immune system mistakenly attacks the synovial lining of joints, leading to chronic inflammation and joint damage. Choice B reason: Although Epstein-Barr virus has been studied as a potential environmental trigger, it is not the direct cause of RA. The disease is primarily autoimmune in nature, with genetic and environmental factors contributing to its development. Choice C reason: RA involves autoimmune-mediated inflammation of the synovium, which leads to pannus formation, erosion of cartilage and bone, and ultimately joint deformity. This accurately describes the core pathophysiology of RA. Choice D reason: While RA is progressive and does damage joint structures, this answer lacks specificity. It does not highlight the autoimmune mechanism or the central role of synovial inflammation.