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': "Tophus is the pathognomic lesion of which of the following condition - \nSelect and explain. \nA. Multiple myeloma, B. Cystinosis, C. Gout, D. Eale's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Gout\n\nGout is the common endpoint of a group of disorders that produce hyperuricemia.\nIt is marked by transient attacks of acute arthritis initiated by crystallization of monosodium urate into the joints, leading eventually to chronic gouty arthritis and deposition of masses of urates in joints and other sites, creating top\nMost common joint involved in gout is a big toe, i.e. metatarsophalangeal joint of the great toe.', 'role': 'assistant'}]