<prompt> Gall stone can be which type of stone?Triple phosphate stoneOxalate stoneCholesterol stoneUrate stone  <response>: Cholesterol stones cholesterol solitaire-radiating crystal line appearance are formed when biles supersaturated with cholesterol or bile acid concentrations are low.80 of gallstones are cholesterolmixed stones in USA Europe,whereas in Asia 80 are pigment stones.Cholesterolmixed stones contain 51-99 pure cholesterol plus an admixture of calcium salts,bile acids,bile pigments phospholipids. Reference:Bailey Loves manual of surgery,25th edition,page no:1120. 