Biology 12 - Diffusion question?

Side A contains a solution of amylase and starch. Side B, which only contains distilled water, is seperated from side A by a semi-permeable membrane. The contents of the beaker are kept at 37 degrees celsius. After 20 minutes, the liquid on side B was tested and a disaccharide was found. Identify the disaccaride and account for its presence on side B