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: Surgery
All are features of seronegative spondyloahropathies except - 
Select and explain. 
A. Uveitis, B. PA factor positive, C. HLA-B27 positive, D. Occur in young age
B: PA factor positive
Answer: B: PA factor positive 
Explanation: Ans. is 'b' i.e., PA factor positive Seronegative spondvloahropathies The seronegative spondyloahropathies are a group of disorders that share ceain clinical features and genetic associations. The word seronegative referes to the absence of rheumatoid factor in this group of disorders. The seronegative spondyloahropathies include ? Ankylosing spondylitis Reactive ahritis --> Reiter syndrome and enteritis associated ahritis Psoriatic ahritis Ahritis associated with inflammatory bowel disease, i.e. enteropathic ahritis Features of seronegative spondyloahropathies Onset usually before 40 years Absence of RA factor HLA - B27 positive Presence of uveitis