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
In a patient with gouty ahritis, synol fluid aspiration will show: 
Select and explain. 
A. Monosodium Urate crystals, B. Calcium Pyrophosphate crystals, C. Mononuclear Leucocytosis, D. Polymorphonuclear Leukocytosis
A: Monosodium Urate crystals
Answer: A: Monosodium Urate crystals 
Explanation: 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