This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Pathology
HLA associated with Rheumatoid ahritis 
Select and explain. 
A. HLA B27, B. HLA DR4, C. HLA B5, D. HLA CW6
B: HLA DR4
Answer: B: HLA DR4 
Explanation: Association of HLA Alleles and Inflammatory DiseasesDiseaseHLA AlleleRelative Risk Ankylosing SpondylitisB2790-100Postgonococcal ahritisB2714Acute anterior uveitisB2714Rheumatoid ahritisDR44Chronic active hepatitisDR313Primary Sjogren syndromeDR39Type 1 DiabetesDR35DR46DR3/DR420