This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arthritis, Subject name: Orthopaedics
[{'content': 'Needle shaped cry stals negatively birefringent on polarized microscopy is characteristic of which crystal associated arthropathy? \nSelect and explain. \nA. Gout, B. CPPD, C. Neuropathic arthropathy, D. Hemophilic arthropathy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Gout o Crystal of Pseudogout :-Made up of calcium pyrophosphateWeakly positive birefringenU rhomboido Crystal of goutMade up of uric acid (monosodium urate)Strongly negative birefringent, needle shaped", 'role': 'assistant'}]