A young infant may be feeding entirely on mother's milk which is white in colour but the stool which the infant passes out is quite yellowish. What is this yellow colour due to?
A
Undigested milk protein casein
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B
Intestinal juice
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C
Bile pigments passed through bile juices
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D
Pancreatic juice poured into duodenum
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Solution
The correct option is C Bile pigments passed through bile juices The yellow colour is due to the presence of bile pigments (bilirubin). Bile is a bitter-tasting greeinish-yellow, alkaline fluid produced by the liver, stored in gall bladder and secreted into the duodenum of vertebrates. It help in digestion and absorption of fats.