This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
Needle-shaped crystals negatively birefringent on polarized microscopy is characteristic of which crystal associated ahropathy? 
Select and explain. 
A. Gout, B. CPPD, C. Neuropathic ahropahty, D. Hemophilic ahropathy
A: Gout
Answer: A: Gout 
Explanation: Crystal of pseudogout:Made up of calcium pyrophosphateWeakly positive birefringent, rhomboidCrystal of goutMade up of uric acid (monosodium urate)(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 433, 434)