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': 'Onion skin spleen is seen in - \nSelect and explain. \nA. ITP, B. Thalassemia, C. SLE, D. Scleroderma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In spleen the central peniciliary arteries show thickening and perivascular fibrosis, producing so called Onion Skin lesions.', 'role': 'assistant'}]