This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Onion peel appearance of splenic capsle is seen in- \nSelect and explain. \nA. SLE, B. Scleroderma, C. RA, D. Sjogrens', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The spleen may be moderately enlarged. Capsular fibrous thickening is common, as is follicular hyperplasia with numerous plasma cells in the red pulp. Central penicilliary aeries characteristically show thickening and perivascular fibrosis, producing onion-skin lesions. Robbins 9 th edition page no. 130', 'role': 'assistant'}]