Iris is part of

Options

A. sclerotic
B. choroid/uvula
C. choroid and retina
D. sclerotic and choroid

Explanation

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the anatomical structure of the iris and what it is a part of.

2. **Understand the Structure of the Eye**: The iris is the colored part of the eye. It is important to recognize its location and function within the eye.

3. **Locate the Iris**: In diagrams of the human eye, the iris surrounds the pupil, which is the opening that allows light to enter the eye.

4. **Function of the Iris**: The iris not only provides color to the eye but also plays a crucial role in controlling the size of the pupil. This regulation helps manage the amount of light that enters the eye.

5. **Anatomical Relationships**: The iris consists of two membranes:
- The **outer membrane**, which is associated with the **choroid** (a layer of blood vessels and connective tissue).
- The **inner membrane**, which is associated with the **retina** (the light-sensitive layer at the back of the eye).

6. **Conclusion**: Based on the anatomical relationships, we can conclude that the iris is part of both the choroid and the retina. However, in the context of the question, it is primarily associated with the choroid.

7. **Final Answer**: Therefore, the correct answer is that the iris is part of the **choroid**.