This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Which of the following HLA types is associated with rheumatoid ahritis 135? \nSelect and explain. \nA. HLA B27, B. HLA DR4, C. HLA B8, D. HLA DP', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HLA B27-Ankylosing spondylitis HLA DR4-Rheumatoid ahritis HLA B8-myasthenia gravis Ref: Textbook of Microbiology Baveja 5th ed Pg 135', 'role': 'assistant'}]