Which one is both hormone and enzyme

Options

A. ADH
B. Angiotensinogen
C. Acetylchoinesterase
D. Renin

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a substance that functions as both a hormone and an enzyme.

2. **Analyzing the Options**:
- **Option A: ADH (Antidiuretic Hormone)**:
- Function: Regulates water balance in the body.
- Classification: It is solely a hormone.
- Conclusion: Incorrect option.

- **Option B: Angiotensinogen**:
- Function: A protein hormone that helps maintain blood pressure and fluid balance.
- Classification: It is only a hormone.
- Conclusion: Incorrect option.

- **Option C: Acetylcholinesterase**:
- Function: An enzyme that breaks down acetylcholine in the body.
- Classification: It is solely an enzyme.
- Conclusion: Incorrect option.

- **Option D: Renin**:
- Function: Secreted by the kidneys and involved in arterial vasoconstriction.
- Classification: It acts as both a hormone and a peptide enzyme.
- Conclusion: Correct option.

3. **Final Answer**: The correct answer is **Renin**, as it functions as both a hormone and an enzyme.