This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which of the following is not seronegative spondyloarthropathy? 
Select and explain. 
A. Reiter's arthritis, B. Ankylosing spondylitis, C. Psorialic arthritis, D. Rheumatoid arthritis
D: Rheumatoid arthritis
Answer: D: Rheumatoid arthritis 
Explanation: Seronegative spondyloarthroparthies are group of disorders with involvement of sacroiliac joint and associated with HLA-B27.
Rheumatoid arthritis doesn't belong to this group.