**Core Concept**
Sucrose, commonly referred to as cane sugar, is a disaccharide composed of glucose and fructose molecules bonded together through a glycosidic linkage. This unique molecular structure allows it to be broken down into its constituent sugars in the digestive system. As a result, cane sugar serves as a primary source of energy for the body.

**Why the Correct Answer is Right**
The correct answer is sucrose. The mechanism of sucrose digestion involves the enzyme sucrase, which is found in the small intestine and breaks down sucrose into its constituent glucose and fructose molecules. This process is essential for the proper absorption of glucose and fructose by the body. The breakdown of sucrose also triggers the release of insulin, a hormone that regulates blood glucose levels.

**Why Each Wrong Option is Incorrect**
**Option A:** Lactose is a disaccharide composed of glucose and galactose, not glucose and fructose.
**Option B:** Maltose is a disaccharide composed of two glucose molecules, not glucose and fructose.
**Option C:** Fructose is a simple sugar (monosaccharide) that is not a disaccharide.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that cane sugar is a disaccharide that requires enzymatic breakdown to be absorbed by the body. This process is crucial for maintaining proper blood glucose levels and preventing conditions such as malabsorption or diabetes.

**Correct Answer:** D. Sucrose.