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
In a patient with gouty arthritis, synovial 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: 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.