Which digestive enzyme is mainly produced by the brush border of the intestines?

The correct answer focuses on the role of the digestive enzymes produced by the brush border of the intestines, which are specialized microvilli lining the intestinal walls. Among these enzymes, one of the key functions is the breakdown of carbohydrates. While salivary amylase begins carbohydrate digestion in the mouth, the main enzymes active in the small intestine—especially those at the brush border—are disaccharidases like maltase, lactase, and sucrase.

The other options do not specifically relate to the brush border's activities. Pepsin is primarily produced in the stomach to initiate protein digestion, and trypsin is produced by the pancreas and secreted into the small intestine to assist in protein digestion as well. Amylase, while important for digesting carbohydrates, is often associated with salivary amylase and pancreatic amylase rather than the brush border of the intestines. Therefore, the primary focus of the brush border enzymes is on disaccharides rather than the enzymes listed in the other choices.