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
[{'content': 'For each extra-articular manifestation of RA, select the most likely diagnosis.Associated with increased frequency of infections. \nSelect and explain. \nA. Felty syndrome, B. rheumatoid vasculitis, C. episcleritis, D. Sjogren syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Felty syndrome consists of chronic RA, splenomegaly, and neutropenia. The increased frequency of infections is due to both decreased number and function of neutrophils.', 'role': 'assistant'}]