A carbohydrate which cannot be hydrolyzed to simpler compounds is called:

Options

A. Monosaccharide
B. Polysaccharide
C. Disaccharide
D. Trisaccharide

Answer

To solve the question, "A carbohydrate which cannot be hydrolyzed to simpler compounds is called:", we need to understand the classification of carbohydrates.

### Step-by-Step Solution:

1. **Understand Carbohydrates**: Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen. They can be classified into three main categories: monosaccharides, oligosaccharides, and polysaccharides.

2. **Identify Monosaccharides**: Monosaccharides are the simplest form of carbohydrates. They consist of a single sugar unit and cannot be broken down into simpler sugars. Common examples include glucose, fructose, and galactose.

3. **Identify Oligosaccharides**: Oligosaccharides consist of 2 to 10 monosaccharide units linked together. They can be hydrolyzed into simpler sugars.

4. **Identify Polysaccharides**: Polysaccharides are complex carbohydrates made up of many monosaccharide units. They can also be hydrolyzed into simpler sugars.

5. **Conclusion**: Since the question asks for a carbohydrate that cannot be hydrolyzed to simpler compounds, the correct answer is monosaccharides. They are the only type of carbohydrate that exists as a single unit and cannot be broken down further.

### Final Answer:
A carbohydrate which cannot be hydrolyzed to simpler compounds is called a **monosaccharide**.