Correct Answer: Pepsin

Solution : The correct option is pepsin.

Pepsin helps to break down complex proteins into simpler forms that can be absorbed in the small intestine. This is essential for the body to obtain essential amino acids for various physiological processes. Pepsin's main role is to break down proteins into smaller peptide fragments. It does so by cleaving peptide bonds in proteins, turning them into smaller polypeptides that can be further digested by other enzymes.