<prompt> HLA B27 is maximally associated with?Rheumatoid arthritisAnkylosing spondylitisRieter syndromePsoriasis  <response>: Clinical Associations with HLA B27DisorderHLA-B27 Ankylosing spondylitis90Reactive arthritis Reithers syndrome 40-80Juvenile SpA70Inflammatory bowel disease35-75Psoriatic arthritisWith spondylitisWith peripheral arthritis 5015Undifferentiated SpA70Acute anterior uveitis50Aortic insufficiency, heart block80 