Which is free swimming stage in the life history of Fasciola?

Options

A. Miracidium
B. Sporocyst
C. Redia
D. None of the above

Answer

To answer the question "Which is the free swimming stage in the life history of Fasciola?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fasciola**: Fasciola is a genus of flatworms, commonly known as liver flukes. They are classified under the phylum Platyhelminthes.

2. **Identifying Hosts**: Fasciola has a life cycle that involves two types of hosts. The primary host is usually a mammal, such as a sheep, while the secondary host is often a snail.

3. **Life Cycle Stages**: The life cycle of Fasciola includes several stages:
- **Miracidium**: This is the free-swimming larval stage that emerges from the eggs in water. It is capable of swimming and seeks out a suitable snail host.
- **Sporocyst**: This stage occurs inside the snail and is not free-swimming. It develops from the miracidium after it penetrates the snail.
- **Redia**: This is another stage that develops from the sporocyst within the snail. It is also not free-swimming.

4. **Identifying the Free-Swimming Stage**: Among the options provided:
- **Miracidium** is the only stage that is free-swimming.
- **Sporocyst** and **Redia** are not free-swimming stages.
- The option "none of the above" is incorrect since we have identified the miracidium as the free-swimming stage.

5. **Conclusion**: The correct answer to the question is that the **miracidium** is the free-swimming stage in the life history of Fasciola.

### Final Answer:
The free swimming stage in the life history of Fasciola is the **miracidium**.

---