Which enzyme is not produced by individuals with lactose intolerance?

Individuals with lactose intolerance lack sufficient amounts of lactase, the enzyme responsible for breaking down lactose, the sugar found in milk and dairy products. Without adequate production of lactase, those with lactose intolerance are unable to effectively digest lactose, leading to gastrointestinal symptoms such as bloating, gas, and diarrhea when they consume dairy.

Amylase, sucrase, and protease are enzymes involved in the digestion of carbohydrates and proteins, and their production is generally not affected by lactose intolerance. Amylase helps in breaking down starches into simpler sugars, sucrase aids in the digestion of sucrose (table sugar), and protease is responsible for protein digestion. Therefore, while these enzymes continue to be produced in individuals with lactose intolerance, lactase is the enzyme that is deficient or absent, making it the correct answer in this context.