The digesting enzyme is: 

1. Trypsinogen
2. Fructose
3. Both a and b
4. None of these

Secreted by the pancreas, trypsinogen(digesting enzyme) converts to trypsin in the small intestine, breaking peptide bonds. Fructose is a sugar, not an enzyme. Other key enzymes include amylase (carbs) and lipase (fats).