In which animal food and its products can you commonly find the disaccharide lactose?

Solution:

The right answer is Carbohydrate

It is compound, including sugars, starches, and dietary fibers, that usual have the general chemical formula (CH2O)n, (where n represents the number of CH20 units in the molecule.) they are a major source of energy for body functions

Plants is the major food sources for carbohydrates

The simple complex main carbohydrate is monosaccharides and disaccharides;  

i thinking chemical change

c should be the answer