Stool of a person contain whitish grey colour due to the malfunction of which type of organ?

The two most important bile pigments are bilirubin, which is orange or yellow, and its oxidized form biliverdin, which is green. Mixed with the intestinal contents, they give the brown colour to the faeces. When bile secretion does not occur, as when the bile duct is completely obstructed by a gallstone, the faeces are greyishwhite.