Iris has

Options

A. Rods
B. Cones
C. Radial and circular muscles
D. Both rods and cones.

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about what the iris has. The iris is a part of the human eye that plays a crucial role in controlling the amount of light that enters the eye.

2. **Identify the Function of the Iris**: The primary function of the iris is to regulate the size of the pupil, which in turn controls the amount of light that enters the eye.

3. **Components of the Iris**: The iris consists of two types of smooth muscles:
- **Circular Muscles**: Also known as sphincter pupillae, these muscles constrict the pupil to reduce the amount of light entering the eye.
- **Radial Muscles**: Also known as dilator pupillae, these muscles dilate the pupil to allow more light to enter.

4. **Evaluate the Options**:
- **Rods**: These are photoreceptor cells located in the retina, not in the iris. They are responsible for vision in low light conditions.
- **Cones**: Similar to rods, cones are also photoreceptor cells found in the retina, responsible for color vision and function in bright light.
- **Radial and Circular Muscles**: This option correctly identifies the components of the iris that control the pupil size.
- **Both Rods and Cones**: Again, these are not part of the iris but are located in the retina.

5. **Conclusion**: Based on the analysis of the options, the correct answer is that the iris has radial and circular muscles.

### Final Answer:
The iris has radial and circular muscles.

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