Which type of protein have hormonal function :

Options

A. Collagen
B. Insulin
C. Trypsin
D. Receptor

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of protein has a hormonal function. Hormonal proteins are typically involved in signaling and regulating biological processes in the body.

2. **Identifying the Options**: The options provided are:
- Collagen
- Insulin
- Trypsin
- Receptor

3. **Analyzing Each Option**:
- **Collagen**: This is a structural protein that provides support and strength to tissues. It does not have a hormonal function.
- **Insulin**: This is a well-known protein hormone produced by the pancreas that regulates blood glucose levels. It is indeed a messenger protein and has a hormonal function.
- **Trypsin**: This is an enzyme that aids in digestion by breaking down proteins. It does not have a hormonal function.
- **Receptor**: While receptors are important for signal transduction, they are not hormones themselves. They detect signals but do not function as hormones.

4. **Conclusion**: Among the options, insulin is the only protein that has a hormonal function. Therefore, the correct answer is **Insulin**.