The statement that is true is: "Pepsin acts on proteins to give peptide." Pepsin is a digestive enzyme produced in the stomach that breaks down proteins into smaller peptide fragments. It is one of the main enzymes responsible for protein digestion in the human body. The other options are incorrect. Ptyalin is an enzyme found in saliva that breaks down starch into maltose and other simple sugars, lactase is an enzyme that breaks down lactose into glucose and galactose, and amylase is an enzyme that breaks down starch into maltose and other simple sugars.