This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': "HLA B27 antigen is associated with all of the following disease except \nSelect and explain. \nA. Ankylosing spondylitis, B. Reiter's syndrome, C. Psoriatic ahorpathy, D. Rheumatoid ahritis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: REF:HARRISONS PRINCIPLE&;S OF INTERNAL MEDICINE 18TH EDITION', 'role': 'assistant'}]