Which type of carbohydrate is considered a complex carbohydrate?

The correct choice is starch, which is classified as a complex carbohydrate. Complex carbohydrates are polymers made up of long chains of glucose molecules linked together, and they can provide sustained energy as they take longer to break down compared to simple carbohydrates. Starch, specifically, is found in foods like potatoes, pasta, and grains and serves as a major energy source in many diets.

In contrast, glucose and sucrose are examples of simple carbohydrates. Glucose is a monosaccharide, meaning it consists of a single sugar unit, while sucrose is a disaccharide composed of glucose and fructose. Lactose, also a disaccharide, is the sugar found in milk and is made up of glucose and galactose.

Understanding the distinction between simple and complex carbohydrates is important, as complex carbohydrates like starch provide more nutrients and fiber, contributing to better overall health and more stable energy levels.