This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Anatomy
[{'content': 'Needle shaped crystals negatively birefringent on polarized microscopy is Characeteristic of which crystal assosciated ahropathy \nSelect and explain. \nA. Gout, B. CPPD, C. Neuropathic ahropathy, D. Hemophilic ahropathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Crystals of gout ----needle shaped and strongly negative bifringent Crystals of pseudogout -----rhomboid shaped and weakly positive bifringent Refer : Harrinson 20thth/e p 2165 maheswari 9th ed', 'role': 'assistant'}]