[A] : Deamination occurs by transaminase enzyme in kidney.
[R]: Removal of COOH group from an amino acid is used in the production of urea.

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 and R is false
D. If both A and R are false

Answer

### Step-by-Step Text Solution:

1. **Understanding the Assertion**: The assertion states that "Deamination occurs by transaminase enzyme in the kidney."
- **Analysis**: Deamination is the process of removing an amino group from an amino acid. The enzyme responsible for this process is typically called deaminase, not transaminase. Transaminase is involved in the transfer of amino groups between amino acids and keto acids, not in the removal of amino groups.

2. **Identifying the Correct Location**: The assertion claims that deamination occurs in the kidney.
- **Analysis**: While deamination can occur in the kidney, it primarily takes place in the liver. The liver is the main site for amino acid metabolism, including deamination.

3. **Conclusion on the Assertion**: Since the assertion incorrectly identifies the enzyme (transaminase instead of deaminase) and implies that deamination primarily occurs in the kidney rather than the liver, the assertion is false.

4. **Understanding the Reason**: The reason states that "Removal of COOH group from an amino acid is used in the production of urea."
- **Analysis**: The production of urea involves the conversion of ammonia and carbon dioxide, not the removal of the carboxyl group (COOH) from an amino acid. The carboxyl group is not directly involved in urea production; instead, it is the amino group that is removed during deamination that leads to the formation of ammonia.

5. **Conclusion on the Reason**: The reason is also incorrect as it misrepresents the biochemical pathway for urea production.

6. **Final Conclusion**: Both the assertion and the reason are false. Therefore, the correct answer is that both A and R are false.