<prompt> Cholesterol Stone made up of:Amorphous cholesterol monohydrateCrystalline cholesterol monohydrateCholesterol PolyhydrateCholesterol with calcium palmitate  <response>: Ans. b Crystalline Cholesterol MonohydrateRef: Bailey and Love 27th Edition Page 1198, Surgery Sixer 3rd Edition Page 579Composition of Each StonesCholesterol Stones: Cholesterol Stones are formed by Nucleation of Cholesterol Monohydrate crystals from multilamellar vesicles. MC type of Gall stone in Western CountriesPigment Stones: Contains 30 Cholesterol Brown pigment stone- composed of calcium bilirubinate, calcium palmitate and calcium stearate as well as cholesterol. Black pigment stone- composed of Largely Insoluble Bilirubin pigment Polymer mixed with Calcium Phosphate and Calcium Bicarbonate 