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: Pathology
To rule out rheumatoid ahriis, most impoant among the followings is - 
Select and explain. 
A. HLA DR8, B. HLA DR4, C. HLA DQ1, D. HLA B27
B: HLA DR4
Answer: B: HLA DR4 
Explanation: Answer- B. HLA DR4DR4 is strongly associated with RA (also with Type 1 DM Pemphigus vulgaris).