Which of the following is NOT among the five listed main liver functions?

• A. Filtration
• B. Digestion
• C. Metabolism and Detoxification
• D. Digestive enzyme production

Answer: (D)

The main idea is understanding what the liver does versus where digestive enzymes come from. The liver filters blood coming from the digestive tract, handles metabolism and detoxification of substances, and it produces bile to aid digestion. It does not produce digestive enzymes themselves. Digestive enzymes like amylase, proteases, and lipases are produced mainly by the pancreas (and, in some cases, saliva) and are responsible for breaking down carbohydrates, proteins, and fats in the gut. Bile from the liver helps emulsify fats but isn’t an enzyme. So the option that lists digestive enzyme production is not a liver function.