Which of the following is the sweetest sugar?

Options

A. fructose
B. glucose
C. sucrose
D. monellin

Answer

To determine which of the following sugars is the sweetest, we will analyze each option provided:

1. **Fructose**: This sugar is commonly known as fruit sugar and is recognized as the sweetest of all naturally occurring sugars. Its sweetness level is approximately 1.7 times sweeter than sucrose (table sugar).

2. **Glucose**: This sugar is less sweet compared to fructose. Its sweetness level is around 0.7 times that of sucrose.

3. **Sucrose**: This is the standard reference sugar, often referred to as table sugar. Its sweetness level is considered to be 1.

4. **Monilin**: This is not a sugar but a sweet protein. While it is sweet, it does not fall under the category of sugars.

Based on the sweetness levels:
- Fructose (1.7) > Sucrose (1) > Glucose (0.7)

Thus, the sweetest sugar among the options provided is **Fructose**.

### Final Answer:
The sweetest sugar is **Fructose**.