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
HLA associated with rhaumatoid ahritis - 
Select and explain. 
A. HLA-B27, B. HLA-DR4, C. HLA-CW6, D. HLA-B8
B: HLA-DR4
Answer: B: HLA-DR4 
Explanation: Ans. is 'b' i.e., HLA-DR4