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: Medicine
[{'content': "Onion skin spleen is seen in \nSelect and explain. \nA. SLE, B. Sjogren's syndrome, C. Thrombotic thrombocytopenic purpura, D. Henoch shonlein purpura", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Onion skin patten is due to Concentric Fibrosis seen in SLE.', 'role': 'assistant'}]