This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Which of the following constitute felty syndrome 
Select and explain. 
A. Rheumatoid, ahritis plenomegaly, and neutropenia, B. Rheumatoid, ahritis, hepatomegaly, and neutropenia, C. Rheumatoid, ahritis, psoriasis, and anemia, D. Rheumatoid, ahritis, splenomegaly, and anemia
D: Rheumatoid, ahritis, splenomegaly, and anemia
Answer: D: Rheumatoid, ahritis, splenomegaly, and anemia 
Explanation: Felty's syndrome, also called Felty syndrome, (FS) is rare autoimmune disease characterized by the triad of rheumatoid ahritis, enlargement of the spleen and too few neutrophils in the blood Ref Davidson 23rd edition pg 796