Why do the eyes of patients turn yellow during jaundice?

Given below are two statements.
Statement $I$: Fat-soluble bilirubin is toxic to brain cells.
Statement $II$: Yellowness of the conjunctiva of eyes and skin,whitish stool,etc.,are some of the symptoms of jaundice.

The following statements are about Marasmus. Select the correct statements.
$I-$ Found in infants less than one year of age.
$II-$ Skin becomes thick and wrinkled.
$III-$ Growth rate and body weight decline.
$IV-$ Impaired growth and development of brain and mental faculties.
$V-$ Protein deficiency,poor growth,replacement of tissue proteins,wasting of body,and thinning of limbs.

$A$ : In acute constipation,purgatives containing magnesium salts are generally used.
$R$ : The osmotic effect of $Mg^{2+}$ in the intestinal lumen prevents water reabsorption from the intestine. $Mg^{2+}$ increases the solute concentration in the intestinal lumen because $Mg^{2+}$ is absorbed very slowly.

Select the correct option regarding disorders of the digestive system.

Which part of the digestive system is affected in celiac disease?