Rheumatoid arthritis is an autoimmune disease that primarily affects the joints. Which of the following is a key diagnostic feature of rheumatoid arthritis?
Symmetrical involvement of small joints of the hands and feet
Elevated anti-nuclear antibody (ANA) titers as the sole diagnostic marker
Baroque art features strong contrasts, while Rococo art prefers more subtle transitions
Baroque art is generally larger in scale than Rococo art

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