Which condition is NOT associated with Primary Sjogren's syndrome?

Primary Sjögren's syndrome is an autoimmune disorder characterized by dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia), resulting from the immune system attacking the salivary and lacrimal glands. The key distinguishing feature of primary Sjögren's syndrome is that it occurs independently, without the presence of another underlying autoimmune disorder.

Dry eyes and dry mouth are the hallmark symptoms of this condition. Additionally, a positive test for SS-A (Ro) or SS-B (La) antibodies is often associated with Sjögren's syndrome and can help in the diagnosis.

Rheumatoid arthritis, on the other hand, is a separate condition, although it can occur concurrently with primary Sjögren's syndrome in its secondary form. When Sjögren's syndrome occurs alongside another autoimmune disorder, it is classified as secondary Sjögren's syndrome. Therefore, rheumatoid arthritis is not a direct feature of primary Sjögren's syndrome itself, making it the correct choice as the condition that is not associated with it.