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
[{'content': 'HLA associated with rheumatoid arthritis: \nSelect and explain. \nA. DR4, B. DR1, C. DR2, D. DR3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Table (Harrison 17th/2051): Significant HLA Class I and Class II Associations with Disease', 'role': 'assistant'}]