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: Surgery
HLA B27 is seen associated with aEUR' 
Select and explain. 
A. Rhematoid ahritis, B. Ankylosing spondylitis, C. Sjogren syndrome, D. Scieroderma
B: Ankylosing spondylitis
Answer: B: Ankylosing spondylitis 
Explanation: Ankylosing spondylitis HLA B27 is associated with: Ankylosing spondylitisQ Reiter's syndromeQ Reactive ahritis (yersinia, salmonella, shigella, Chlamydia) Psoriatic spondylitisQ