<prompt> HLA B-27 has 90 association with?EnteropathicReactive arthritisRheumatoid arthritisAnkylosing spondylitis  <response>: Ans. d Ankylosing spondylitisRef: Harrison 18thchapter 325Prevalence of HLA B27 is 90 in patients with Ankylosing Spondylitis, independent of disease severity. 