AS is strongly associated with HLA-B27 (however, not all patients with HLA-B27 serotype will develop AS)

• Presentation most consistent with ankylosing spondylitis (young person with inflammatory back pain (stiff for >1 hour upon waking and improves with movement) who specifically has involvement of sacroiliac joints)
• HLA-B27 positivity is a risk factor for PAIR diagnoses (Psoriatic arthritis, Ankylosing spondylitis, IBD related inflammatory arthritis and Reiter/Reactive arthritis)
• Patient would have elevated ESR

It would be so great if all the questions on the real deal are so straightforward and a lot of suckers answer them wrong, so nice guys like me and you could get more points :)! Dreams, sweet dreams...