Which of the following is a trisaccharide ?

Options

A. Stachyrose
B. Sucrose
C. Raffinose
D. Ribose

Answer

To determine which of the following is a trisaccharide, we need to understand what a trisaccharide is. A trisaccharide is a carbohydrate that, upon hydrolysis, yields three monosaccharide units.

Let's analyze the options given:

1. **Stachyose**:
- Upon hydrolysis, stachyose yields four monosaccharides: two glucose units, one fructose unit, and one galactose unit. Therefore, it is a tetrasaccharide.

2. **Sucrose**:
- Sucrose is a disaccharide because it consists of two monosaccharides: glucose and fructose. Upon hydrolysis, it yields these two monosaccharides.

3. **Raffinose**:
- Raffinose, when hydrolyzed, yields three monosaccharides: galactose, glucose, and fructose. Thus, it is a trisaccharide.

4. **Ribose**:
- Ribose is a monosaccharide (specifically an aldopentose) and does not qualify as a trisaccharide.

Based on the analysis above, the only option that qualifies as a trisaccharide is **Raffinose**.

### Final Answer:
**Raffinose is the trisaccharide.**

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