Name a homopolysachharide used in testing of kidney function.

Explanation

**Step-by-Step Solution:**

1. **Understanding Homopolysaccharides**: A homopolysaccharide is a type of polysaccharide that is made up of only one type of monosaccharide unit. The prefix "homo-" indicates that all the monomers are the same.

2. **Identifying the Context**: The question specifically asks for a homopolysaccharide that is used in testing kidney function. In the context of kidney function, we are often concerned with measuring the glomerular filtration rate (GFR).

3. **Recognizing the Relevant Homopolysaccharide**: The homopolysaccharide that is commonly used in clinical settings to assess kidney function is **inulin**. Inulin is a fructan, which means it is composed of fructose monomers.

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