**Core Concept**
Fructans are a type of homopolysaccharide composed entirely of fructose molecules. They are commonly found in various plant-based foods and are known for their potential prebiotic effects.

**Why the Correct Answer is Right**
Fructans are formed through the polymerization of fructose molecules, which are linked together by glycosidic bonds. This process is facilitated by enzymes such as fructosyltransferase, which catalyzes the transfer of fructose molecules from one molecule to another. The resulting fructans can vary in length and structure, but they are all composed primarily of fructose units.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a type of fructan. While some fructans may be composed of other sugars, the term "homopolysaccharide of fructose" specifically refers to a polymer composed entirely of fructose units.
**Option B:** This option is incorrect because it describes a type of polysaccharide composed of glucose units, not fructose units.
**Option C:** This option is incorrect because it describes a type of disaccharide composed of glucose and fructose units, not a homopolysaccharide composed entirely of fructose units.

**Clinical Pearl / High-Yield Fact**
Fructans can be beneficial for gut health by serving as prebiotics, which help promote the growth of beneficial gut bacteria. However, some individuals may experience adverse effects, such as bloating and abdominal discomfort, due to their inability to digest fructans.

**Correct Answer: C. Inulin. Inulin is a type of homopolysaccharide composed entirely of fructose units.**