Lens of eye retina is developed from

Options

A. ectoderm
B. mesoderm
C. endoderm
D. Both (a) and (b)

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the embryonic layer from which the lens of the eye retina is developed.

2. **Identifying the Options**: The options provided are ectoderm, mesoderm, endoderm, and both A and B (ectoderm and mesoderm).

3. **Reviewing Embryonic Layers**:
- **Ectoderm**: This is the outermost layer of the embryo and is responsible for forming structures such as the skin, hair, and nervous system. It also contributes to the formation of the lens of the eye and the retina.
- **Mesoderm**: This middle layer gives rise to muscles, bones, and the circulatory system.
- **Endoderm**: This is the innermost layer, which forms internal organs such as the digestive tract and respiratory system.

4. **Determining the Correct Layer**: The lens of the eye is specifically derived from the ectoderm. The ectodermal cells differentiate to form the lens during embryonic development.

5. **Conclusion**: Based on the information reviewed, the lens of the eye retina is developed from the ectoderm.

### Final Answer:
The lens of the eye retina is developed from the **ectoderm**.

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