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: Medicine
[{'content': "HLA 27 antigen is associated with all of the following disease except - \nSelect and explain. \nA. Ankylosing spondylitis, B. Reiter's syndrome, C. Psoriatic arthorpathy, D. Rheumatoid arthritis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]