Select the odd with respect to enzymes present in adult human.

Options

A. Rennin
B. Renin
C. Trypsin
D. Pepsin

Answer

To solve the question of identifying the odd enzyme with respect to enzymes present in adult humans, we will analyze each of the options provided.

### Step-by-Step Solution:

1. **Identify the Enzymes**: The question presents four enzymes. We need to evaluate each one to determine if it is present in adult humans.

2. **Evaluate Renin (Option 1)**:
- Renin is an enzyme that is primarily involved in the digestion of milk protein (casein) in infants.
- It is responsible for curdling milk, which is essential for the digestion of milk in young humans.
- In adults, renin is absent in the digestive system, making it the odd one out.

3. **Evaluate Renin (Option 2)**:
- This refers to a different context of renin, specifically in the renin-angiotensin system, which is involved in blood pressure regulation and fluid balance.
- This form of renin is present in both infants and adults, so it does not qualify as the odd enzyme.

4. **Evaluate Trypsin (Option 3)**:
- Trypsin is a proteolytic enzyme that digests proteins and is present in both infants and adults.
- It is not the odd enzyme since it is common to both age groups.

5. **Evaluate Pepsin (Option 4)**:
- Pepsin is another protein-digesting enzyme that is active in the stomach and is also present in both infants and adults.
- Like trypsin, it is not the odd enzyme.

### Conclusion:
The odd enzyme with respect to enzymes present in adult humans is **Renin (Option 1)**, as it is primarily found in infants for milk digestion and is absent in adults.