This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
[{'content': 'HLA B-27 has > 90% association with? \nSelect and explain. \nA. Enteropathic, B. Reactive arthritis, C. Rheumatoid arthritis, D. Ankylosing spondylitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Ankylosing spondylitis(Ref: Harrison 18th/chapter 325)Prevalence of HLA B27 is 90% in patients with Ankylosing Spondylitis, independent of disease severity.', 'role': 'assistant'}]