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 each extra-articular manifestation of RA, select the most likely diagnosis.Associated with increased frequency of infections. 
Select and explain. 
A. Felty syndrome, B. rheumatoid vasculitis, C. episcleritis, D. Sjogren syndrome
A: Felty syndrome
Answer: A: Felty syndrome 
Explanation: Felty syndrome consists of chronic RA, splenomegaly, and neutropenia. The increased frequency of infections is due to both decreased number and function of neutrophils.