Which of the following is a function of lactose?

Lactose serves as an energy source, particularly for infants. This disaccharide sugar is found in milk and dairy products, providing a crucial source of energy for newborns who rely predominantly on milk for nutrition during the early stages of life. Lactose is broken down in the body into glucose and galactose, which are readily absorbed and utilized by the body, thus supporting growth and development.

Other options do not accurately describe the role of lactose. While some carbohydrates can serve as energy storage or help in the digestion of plant fibers, lactose specifically is not involved in these functions. Additionally, lactose is not a source of protein; instead, proteins are composed of amino acids and found in various food sources besides lactose.