This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
For extra-articular manifestation of RA, select the most likely diagnosis.Most common form of eye involvement 
Select and explain. 
A. Felty's syndrome, B. rheumatoid vasculitis, C. episcleritis, D. Sjogren's syndrome
D: Sjogren's syndrome
Answer: D: Sjogren's syndrome 
Explanation: Direct eye involvement with the rheumatoid process (episcleritis or scleritis) occurs in less than 1% of patients. However, 15-20% may develop Sjogren's syndrome with attendant keratoconjunctivitis sicca.