A polypeptide that regulates hunger is

Options

A. Endorphin
B. Encephalin
C. Insulin
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific polypeptide that regulates hunger. We need to identify which of the given options is correct.

2. **Analyzing the Options**: The options provided are:
- Endorphins
- Encephalin
- Insulin
- None of the above

3. **Researching Each Option**:
- **Endorphins**: These are polypeptides produced in the body that help in pain perception, stress reactions, and also play a role in regulating hunger by binding to opioid receptors in the nervous system.
- **Encephalin**: This is also a type of endorphin that primarily functions in pain regulation and is not specifically known for regulating hunger.
- **Insulin**: This hormone is primarily responsible for regulating blood sugar levels and does not directly regulate hunger.
- **None of the above**: This option would be correct only if none of the previous options were valid.

4. **Identifying the Correct Answer**: Based on the functions of the polypeptides discussed:
- Endorphins are known to regulate hunger by acting on the nervous system.
- Encephalin is related to pain control.
- Insulin is related to blood sugar regulation.

Therefore, the correct answer is **Endorphins**.

5. **Final Answer**: The polypeptide that regulates hunger is **Endorphins**.

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