Which enzyme is associated with production of urea?

Options

A. Urease
B. Arginase
C. Aspartase
D. Glutaminase

Answer

### Step-by-Step Solution

1. **Understanding Urea Production**: Urea is produced in the liver through a process known as the ornithine cycle (or urea cycle). This cycle converts toxic ammonia into urea, which is less toxic and can be safely excreted.

2. **Identifying the Enzymes Involved**: The ornithine cycle involves several key enzymes that facilitate the conversion of ammonia into urea. The main enzymes involved in this cycle are:
- Carbamoyl phosphate synthetase
- Ornithine carbamoyltransferase
- Argininosuccinate synthase
- Argininosuccinate lyase
- Arginase

3. **Analyzing the Options**: The question provides four options: urease, arginase, aspartate, and glutaminase. Among these, we need to identify which enzyme is specifically associated with the production of urea.

4. **Selecting the Correct Answer**:
- **Urease**: This enzyme breaks down urea into ammonia and carbon dioxide, so it is not involved in urea production.
- **Aspartate**: This is an amino acid and not an enzyme.
- **Glutaminase**: This enzyme converts glutamine into glutamate and ammonia, but it is not directly involved in urea production.
- **Arginase**: This enzyme catalyzes the final step of the urea cycle where arginine is converted into urea and ornithine.

5. **Conclusion**: The enzyme that is directly associated with the production of urea in the ornithine cycle is **arginase**.

### Final Answer
**Arginase** is the enzyme associated with the production of urea.