A patient is suspected of having a GI intolerance to a speci…

A patient is suspected of having a GI intolerance to a specific disaccharide, but his doctors are unsure which one is causing the problems.  Following an overnight fast, the patient consumes a solution containing 50 grams of lactose and 50 grams of sucrose.  His blood fructose and galactose levels are measured at 30, 60, and 90 minutes after ingestion.  The results are in the following table. What disaccharide can the patient not digest?