Which of the following is not a digenetic worm?

Options

A. Fasciola
B. Wuchereria
C. Enterobius
D. Taenia

Explanation

To determine which of the following organisms is not a digenetic worm, we need to understand the definition of digenetic worms and analyze the options provided.

### Step-by-Step Solution:

1. **Understand the Definition of Digenetic Worms:**
- Digenetic worms are organisms that complete their life cycle in two different hosts. They are typically endoparasites, meaning they live inside their hosts.

2. **Analyze the Options:**
- **Option A: Fasciola**
- Fasciola is a type of liver fluke that requires two hosts to complete its life cycle (usually a snail and a mammal). Therefore, it is a digenetic worm.

- **Option B: Wicharia**
- Wicharia, also known as a nematode, also completes its life cycle in two hosts. Thus, it is also a digenetic worm.

- **Option C: Enterobius**
- Enterobius, commonly known as the pinworm, is found in the large intestine of humans and completes its life cycle in a single host (humans). Therefore, it is not a digenetic worm.

- **Option D: Taenia**
- Taenia, commonly known as tapeworms, requires two hosts to complete its life cycle (typically a pig or cow and a human). Hence, it is a digenetic worm.

3. **Conclusion:**
- Based on the analysis, the organism that is not a digenetic worm is **Enterobius**.

### Final Answer:
**Enterobius** is not a digenetic worm.