Yellow colour of the urine is due to Urochrome, which is synthesized by the oxidation of(a) Stercobilin(b) Uric Acid(c) Bile(d) Cholesterol

The yellow color of urine is primarily due to the presence of a pigment called urochrome. Urochrome is a waste product formed from the breakdown of hemoglobin from old red blood cells. It's not directly synthesized, but rather a byproduct of the breakdown process.

Among the options you provided, none of them are directly responsible for the yellow color of urine through urochrome:

(a) Stercobilin: This is a brown pigment formed from the breakdown of bilirubin in the intestines and contributes to the color of feces, not urine.

(b) Uric Acid: Uric acid is a waste product formed from the breakdown of purines in the body. It can contribute to the color of urine in certain situations, but it's not the primary factor responsible for the yellow color.

(c) Bile: Bile is produced by the liver and stored in the gallbladder. It helps in the digestion of fats in the intestines and contributes to the color of feces (giving them a brown color), but it's not the main factor responsible for the yellow color of urine.

(d) Cholesterol: Cholesterol is a lipid molecule that plays various roles in the body, including being a component of cell membranes and a precursor to certain hormones. It's not directly related to the color of urine.

Again, the yellow color of urine is mainly due to the presence of urochrome, a byproduct of hemoglobin breakdown.