Small Intestine: Chemical Digestion by Brush Border & Pancreas

The correct answer is pancreas.

The small intestine is where most of the chemical digestion occurs. The enzymes that perform chemical digestion come from two sources: the brush border cells of the small intestine and the pancreas. The brush border cells produce enzymes such as sucrase, lactase, and maltase, which break down carbohydrates. The pancreas produces enzymes such as amylase, lipase, and protease, which break down carbohydrates, fats, and proteins, respectively. These enzymes are released into the small intestine, where they mix with the food and begin to break it down into smaller molecules.