Concept:The duodenum is the main site where pancreatic enzymes and bile act on food.
Explanation:The duodenum receives pancreatic juice containing amylase, trypsin, and lipase.
These enzymes digest starch, proteins, and lipids respectively.
Bile from the liver is also released into the duodenum to emulsify fats.
Removing the duodenum prevents these enzymes and bile from mixing with food.
Therefore, digestion of all three major food types is affected.
Answer:D. starch, protein and lipids