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 ?

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