Toothpaste and mud are examples of sol.

Explanation

To determine whether toothpaste and mud are examples of a sol, we need to analyze the definitions and characteristics of a sol.

### Step-by-Step Solution:

1. **Understanding the Definition of a Sol**:
- A sol is a type of colloidal solution where solid particles are dispersed in a liquid medium. The dispersed phase is solid, and the dispersion medium is liquid.

2. **Analyzing Toothpaste**:
- Toothpaste typically contains solid particles (like abrasives) dispersed in a liquid medium (water or glycerin). Therefore, it fits the definition of a sol.

3. **Analyzing Mud**:
- Mud consists of solid particles (such as clay, silt, and organic matter) suspended in water. This also fits the definition of a sol, as the solid particles are dispersed in a liquid medium.

4. **Conclusion**:
- Both toothpaste and mud have a solid dispersed phase and a liquid dispersion medium. Hence, they are indeed examples of a sol.

### Final Answer:
Toothpaste and mud are examples of sol because they both consist of solid particles dispersed in a liquid medium.

---