This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune Diseases, Subject name: Pathology
[{'content': 'HLA associated with rheumatoid arthritis is - \nSelect and explain. \nA. HLA B27, B. HLA DR 4, C. HLA B19, D. HLA DR2', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. HLA DR4 HLA's in Rheumatoid arthritisAssociated with the dev elopement of Rheumatoid arthritis# HLA-DR4# HLA-DR 10# HLA-DR9# HLA-DR 3 (Arabs)Protects against the development of Rheumatoid arthritis# HLA-DR5# HLA-DR2# HLA-DR3# HLA-DR7", 'role': 'assistant'}]