Which disaccharide and food source pairing is correct, and which clinical condition would impair its digestion?

• A. Sucrose — plain cooked rice; amylase deficiency specifically prevents sucrose digestion leading to bloating after rice consumption.
• B. Lactose — refined table sugar; glucose oxidase deficiency impairs lactose digestion producing sweet taste loss.
• C. Lactose — milk and dairy products; lactase deficiency (lactose intolerance) impairs its digestion causing gastrointestinal symptoms.
• D. Maltose — citrus fruit; sucrase deficiency impairs its digestion causing immediate muscle cramps on consumption.

Answer: (C)