Question

the two main types of fiber are
soluble and insoluble.
cellulose and mannitose.
refined and unrefined.
saccharides and bran.

Explanation:

Dietary fiber is primarily classified based on its solubility in water. Soluble fiber dissolves in water and forms a gel-like substance, while insoluble fiber does not dissolve and adds bulk to stool. The other options are incorrect: cellulose is a type of insoluble fiber, mannitose is a sugar alcohol; refined/unrefined refers to processing status, not fiber type categories; saccharides are sugars, and bran is a source of fiber, not main fiber types.

Answer:

soluble and insoluble.