This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
Ankylosing spondylitis is associated with 
Select and explain. 
A. HLA-B27, B. HLA-B-8, C. HLA-DW4/DR4, D. HLA-DR3
A: HLA-B27
Answer: A: HLA-B27 
Explanation: There is a strong correlation with HLA-B2790-95% of cases are positive for HLA-B27(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 302, 426)