The in breast milk to establish and maintain growth of desired bacteria in the gastrointestinal tract.
a. epidermal growth factor
b. oligosaccharides
c. lactadherin
d. lactoferrin
e. transforming growth factor - beta

In the following choices above, the correct answer that will fit the question is letter b, oligosaccharides. It is because the oligosaccharides in the breast milk enables to establish and to maintain the bacteria that is needed by the baby in his or her GI tract. This is important for the baby for this is essential or needed by the GI tract as he or she grows and without this could cause effects that could be harmful to the body.