This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'HLA DQA1 is associated with \nSelect and explain. \nA. SLE, B. Sjogrens syndrome, C. Scleroderma, D. Ankylosing spondylosis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Molecular analysis of human leukocyte antigen (HLA) class II genes has revealed that Sjogren's syndrome, regardless of the patient's ethnic origin, is highly associated with the HLA DQA1*0501 allele. Reference: Harrison 19th edition PG: 2166", 'role': 'assistant'}]