Factors controlling regeneration seem to be

Options

A. Neural
B. Hormonal
C. Both neural and hormonal
D. Genetic

Answer

### Step-by-Step Solution:

1. **Understanding Regeneration**:
- Regeneration is the ability of an organism to restore or replace damaged or lost body parts. This ability varies between organisms, being more pronounced in lower organisms compared to higher ones.

2. **Identifying the Factors**:
- The factors that control regeneration can be broadly categorized into two types: neural factors and hormonal factors.

3. **Neural Factors**:
- Neural factors play a significant role in regeneration. For instance, when a skin injury occurs, the damaged cells trigger a response from the nervous system.
- Nerves in the area of injury release neurotrophic factors that promote healing and regeneration. This communication between nerves and the central nervous system is crucial for effective regeneration.

4. **Hormonal Factors**:
- Hormonal factors also significantly influence regeneration. Various hormones and growth factors are secreted, primarily by the pituitary gland, which is known as the master gland.
- Important growth factors involved in healing include glial growth factors and fibroblast growth factors, which are present at the site of injury and facilitate the healing process.

5. **Conclusion**:
- Both neural and hormonal factors are essential for regeneration. While genetic factors may influence certain traits, they do not directly control the regeneration process. Therefore, the correct answer to the question is that regeneration is controlled by both neural and hormonal factors.

### Final Answer:
**Both neural and hormonal factors control regeneration.**

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