Which type of tissue forms the inner lining of a blood vessel ?

Explanation

### Step-by-Step Solution:

1. **Identify the Types of Tissues**: Understand that there are four primary types of tissues in the body: epithelial, connective, muscle, and nervous tissues.

2. **Define Epithelial Tissue**: Epithelial tissue is the most common type of tissue in the body. It serves various functions, including covering and lining organs, absorption, secretion, and protection.

3. **Understand the Role of Epithelial Tissue**: Epithelial tissues are responsible for forming the inner lining of organs and structures, including blood vessels. They have a unique structure that includes:
- A free surface that is not attached to other cells.
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