The answer is A. Sucrose.
Sucrose is a disaccharide, which is a type of sugar that is made up of two monosaccharides, glucose and fructose. It is found in many fruits and vegetables, as well as in table sugar.
Ptyalin, amylase, pepsin, and lipase are all enzymes that are involved in digestion. Ptyalin is an enzyme that breaks down starch into maltose. Amylase is an enzyme that breaks down starch into glucose. Pepsin is an enzyme that breaks down proteins into peptides. Lipase is an enzyme that breaks down lipids into fatty acids and glycerol.
Sucrose is not an enzyme. It is a type of sugar. Therefore, it is the odd one out in the list.