The yellow color of urine is due to the presence of [D] Urochrome. Urochrome, also known as urobilin, is a pigment resulting from the breakdown of hemoglobin during the normal metabolic processes in the liver. After hemoglobin is broken down, bilirubin is produced, which is further processed and excreted in bile. Some of the bilirubin is converted into urobilinogen in the intestines, which is then oxidized by intestinal bacteria to form urochrome.
Urochrome is filtered from the blood by the kidneys and excreted in urine, giving it a yellow color. The intensity of the yellow color can vary depending on factors such as hydration levels, diet, and certain medications. Therefore, the presence of urochrome is responsible for the typical yellow hue observed in urine.