<prompt> Needle shaped cry stals negatively birefringent on polarized microscopy is characteristic of which crystal associated arthropathy?GoutCPPDNeuropathic arthropathyHemophilic arthropathy  <response>: 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 urateStrongly negative birefringent, needle shaped 