Enzyme hirudin is present in the saliva of

Options

A. Leech
B. Earthworm
C. Scorpion
D. Cobra

Answer

To answer the question regarding which organism has the enzyme hirudin present in its saliva, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hirudin**: Hirudin is a naturally occurring peptide that acts as an anticoagulant, meaning it prevents blood from clotting. This is important for certain organisms that feed on blood.

2. **Identifying the Organisms**: The options given are:
- A. Leech
- B. Earthworm
- C. Scorpion
- D. Cholera

3. **Analyzing Each Option**:
- **Leech**: Leeches are known for their blood-feeding habits. They secrete hirudin in their saliva to prevent the blood of their host from clotting while they feed.
- **Earthworm**: Earthworms do not have a blood-feeding lifestyle and do not produce hirudin.
- **Scorpion**: Scorpions are predators but do not feed on blood, and thus do not produce hirudin.
- **Cholera**: Cholera is a disease caused by bacteria and does not produce any enzymes like hirudin.

4. **Conclusion**: Based on the analysis, the only organism from the options that produces hirudin in its saliva is the leech.

### Final Answer:
The enzyme hirudin is present in the saliva of **A. Leech**.

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