<prompt> In a patient with gouty ahritis,synol fluid aspiration was done,strongly negative birefringent needle shaped crystals were seen under polarized light .These crystals are composed of which of the following ?Monosodium urateCalcium pyrophosphateSodium pyrophosphateHomogentisic acid  <response>: Crystals of monosodium urate are needle-shaped, 5-25 mm in length, and strongly negatively bifringent under polarized light. Crystallization of monosodium urate in synol fluid and tissues results in a dramatic inflammatory response characterized by erythema, edema, and intense pain. Double contour cailage line on USG is seen 