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: Unknown
Which of the following is not a seronegative spondyloarthropathy - 
Select and explain. 
A. Psoriatic arthritis, B. Ankylosing spondylitis, C. RA, D. Reiters arthritis
C: RA
Answer: C: RA 
Explanation: Ans. is 'c' i.e., RA Seronegative spondyloarthropathieso The seronegative spondyloarthropathies are a group of disorders that share certain clinical features and genetic associations.o The word seronegative referred to the absence of rheumatoid factor in this group of disorders,o The seronegative spondyloarthropathies include -Ankylosing spondylitisReactive arthritis - Reiter syndrome and enteritis associated arthritisPsoriatic arthritisArthritis associated with inflammatory bowel disease, i.e. enteropathic arthritis.