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
[{'content': 'All are features of seronegative spondyloarthropathies except - \nSelect and explain. \nA. Uveitis, B. RA factor positive, C. HLA-B27 positive, D. Occur in young age', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., RA factor positive Seronegative spondyloarthropathies o The seronegative spondyloarthropathies are a group of disorders that share certain clinical features and genetic associations. The word seronegative refers to the absence of rheumatoid factor in this group of disorders. The seronegative spondyloarthropathies include - Ankylosing spondylitis Reactive arthritis - Reiter syndrome and enteritis associated arthritis Psoriatic arthritis Arthritis associated with inflammatory bowel disease, i.e. enteropathic arthritis Features of seronegative spondyloarthropathies o Onset usually before 40 years o The absence of RA factor o HLA - B2 7 positive o Presence of uveitis", 'role': 'assistant'}]