(b) Bilirubin
The pigment molecule that increases in the blood and induces the yellowish color of the skin described as Jaundice is (b) Bilirubin. Jaundice occurs when there is an accumulation of bilirubin in the bloodstream, which can be due to various medical conditions affecting the liver or the breakdown of red blood cells. This excess bilirubin can lead to the yellowing of the skin and the whites of the eyes.