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': 'Tophi in gout found in all regions except -a)  Joint capsuleb)  Skinc)  Muscled)  Articular cartilagee)  Synovial membrane \nSelect and explain. \nA. ae, B. b, C. ab, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tophi are pathognomic of gout. They are formed by large aggregations of urate crystals. The urate crystals are surrounded by -\n\n\nMacrophages\nLymphocytes\nLarge foreign body giant cells\n\n\nThey are seen in the-\n\n\nArticular cartilages of joints\nPeriarticular ligaments\nTendons and soft tissues\nAchilles tendon\nEar lobes\n\n\nLess common sites of involvement are -\n\na) Kidney\nb) Nasal cartilage\nc)\xa0 Skin of the finger tips, palms or soles.', 'role': 'assistant'}]