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A young infant may be feeding entirely on mother's milk which is white in colour but the stools which the infant passes out is quite yellowish. What is this yellow colour due to?

1. bile pigments passed through bile juice
2. undigested milk protein casein
3. pancreatic juice poured into duodenum
4. intestinal juice

Correct answer: bile pigments passed through bile juice

Solution

The yellow color of infant stool comes from bile pigments, especially bilirubin derivatives, that enter the intestine with bile. These pigments are converted by gut bacteria into colored compounds that give stool its yellowish appearance.

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