Discussion
Which of the following is a pigment found in faecal matter ?
Answer: B
The pigment found in faecal matter is urobilinogen, option (B), a colourless product of the breakdown of bilirubin by the gut bacteria, which is turned in the air to the brown pigments, with stercobilin as the end product, that give faeces their colour. Titanium oxide is a white mineral pigment of paints, creatinine is a waste product found in urine, and keratin is the protein of hair and nails, so (A), (C) and (D) are not pigments of faeces. Stercobilin is the pigment that is chiefly responsible for the brown colour, and a stool without it, as in an obstruction of the bile duct, is pale.
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