The correct answer is the Liver.
Jaundice happens when there is too much bilirubin, a yellow pigment formed when old red blood cells break down, built up in the blood. Normally the liver processes this bilirubin and removes it from the body through bile, but when the liver is damaged or diseased, bilirubin builds up and causes the skin and eyes to turn yellow.
Common causes of jaundice include hepatitis, liver infections, blockage of bile ducts, and excessive breakdown of red blood cells. Treatment depends on finding and fixing the underlying cause that is affecting the liver.