This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': "Which of the following is having a 90% associated with HLA B27 \nSelect and explain. \nA. Ankylosing spondylitis, B. Rheumatoid ahritis, C. Psoriasis, D. Reiter's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Robbins 9/e p205 A positive result meansHLA-B27 was found in your blood. You may have a higher-than-average risk of ceain autoimmune diseases, such as ankylosing spondylitis and reactive ahritis.', 'role': 'assistant'}]