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: Surgery
[{'content': 'In a patient with gouty ahritis, synol 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: Demonstration of intracellular Monosodium Urate Crystals (MSU) in synol fluid from affected joint is diagnostic of gout. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 2046; Current Rheumatology Diagnosis and Treatment, 2nd Edition, Page 467", 'role': 'assistant'}]