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
Which of the following HLA types is associated with rheumatoid ahritis 135? 
Select and explain. 
A. HLA B27, B. HLA DR4, C. HLA B8, D. HLA DP
B: HLA DR4
Answer: B: HLA DR4 
Explanation: HLA B27-Ankylosing spondylitis HLA DR4-Rheumatoid ahritis HLA B8-myasthenia gravis Ref: Textbook of Microbiology Baveja 5th ed Pg 135