Assertion. Deamination takes place in the hepatocytes by oxidase by oxidase enzyme, producing `NH_(3)`.
Reason. Ornithine cycle combines `NH_(3)` and `CO_(2)` to form urea in the adipocytes.

Options

A. If both A and R are true and R is the correct explanation of A.
B. If both A and R are true but R is not the correct explanation of A.
C. If A is true but R is false.
D. If both A and R are false.

Answer

To solve the question, we need to evaluate both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Deamination takes place in the hepatocytes by oxidase enzyme, producing NH3."
- Deamination is the process where an amino group is removed from an amino acid, resulting in the production of ammonia (NH3).
- This process primarily occurs in the liver, specifically in hepatocytes, which are the liver cells. The oxidase enzyme is involved in this process.

2. **Evaluating the Reason**:
- The reason states that "Ornithine cycle combines NH3 and CO2 to form urea in the adipocytes."
- The ornithine cycle (or urea cycle) is a series of chemical reactions that take place in the liver, where ammonia (NH3) is converted into urea, which is less toxic and can be excreted from the body.
- The reason incorrectly states that this process occurs in adipocytes (fat cells). In reality, the ornithine cycle occurs in the hepatocytes (liver cells).

3. **Conclusion**:
- The assertion is true because deamination occurs in the hepatocytes and produces NH3.
- The reason is false because the ornithine cycle occurs in the hepatocytes, not in adipocytes.
- Therefore, the correct answer is that the assertion is true, but the reason is false.

### Final Answer:
- Assertion: True
- Reason: False
- Correct option: A is true but R is false.