The iris of the eye is like an extension of

Options

A. retina
B. cornea
C. sclerotic
D. choroid

Answer

To answer the question "The iris of the eye is like an extension of," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Eye**:
- The human eye consists of three distinct layers: the outer layer, the middle layer, and the inner layer.

2. **Identifying the Middle Layer**:
- The middle layer of the eye includes three important components: the choroid, the ciliary body, and the iris.

3. **Examining the Choroid**:
- The choroid is a dark pigmented layer that contains blood vessels. It is responsible for nourishing the eye and is located between the sclera (outer layer) and the retina (inner layer).

4. **Understanding the Ciliary Body**:
- The ciliary body is a thickening of the choroid at the anterior part of the eye. It plays a role in focusing the lens.

5. **Identifying the Iris**:
- The iris is the colored part of the eye and is shaped like a donut. It is located at the front of the eye and is an extension of the choroid.

6. **Function of the Iris**:
- The primary function of the iris is to regulate the size of the pupil, thereby controlling the amount of light that enters the eye.

7. **Conclusion**:
- Since the iris is formed from the choroid and is considered an extension of it, the correct answer to the question is that the iris is an extension of the choroid.

### Final Answer:
The iris of the eye is like an extension of the **choroid**.

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