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: Orthopaedics
[{'content': 'In a patient with gouty arthritis, synovial fluid aspiration will show - \nSelect and explain. \nA. Monosodium Urate crystals, B. Calcium Pyrophosphate crystals, C. Mononuclear Leucocytosis, D. Polymorphonuclear Leukocytosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The definitive diagnosis of gout is made by examination of synovial fluid or tophaceous material with polarized light microscopy and identifying the characteristic monosodium urate crystals.', 'role': 'assistant'}]