The correct answer is B. Enzyme.
Pepsin is a digestive enzyme that breaks down proteins into smaller peptides and amino acids. It is produced in the stomach and secreted into the stomach lumen, where it helps to digest food. Pepsin is a protease, which means that it breaks down proteins by hydrolyzing the peptide bonds that hold them together. It is most active at a pH of 2-3, which is the pH of the stomach.
Hormones are chemical messengers that are produced by glands and transported through the bloodstream to target cells. They regulate a variety of physiological processes, including metabolism, growth, and reproduction.
Vitamins are essential nutrients that the body cannot produce on its own. They are found in a variety of foods and are necessary for normal growth and development.
Minerals are inorganic elements that are essential for human health. They are found in a variety of foods and are necessary for the proper functioning of the body.