Metacercaria of Liver Fluke is

Options

A. Free swimming stage
B. Encysted stage
C. Nonencysted non motile stage
D. Free floating stage

Answer

### Step-by-Step Solution:

1. **Understanding the Organism**: The liver fluke, scientifically known as *Fasciola hepatica*, belongs to the phylum Platyhelminthes and is classified as a digenetic organism. This means it requires two hosts to complete its life cycle.

2. **Identifying the Hosts**: The primary host of the liver fluke is typically sheep or goats, while the secondary host is a snail. The life cycle begins when the liver fluke infects the liver and bile ducts of the primary host.

3. **Egg Development**: The liver fluke lays eggs in the feces of the infected sheep. These eggs hatch into a free-swimming larval stage known as the miracidium.

4. **Miracidium to Cercaria**: The miracidium is then consumed by the snail (the secondary host), where it undergoes several transformations. It develops into a sporocyst, then a redia, and finally into a cercaria. The cercaria is characterized by having a tail.

5. **Cercaria to Metacercaria**: Once the cercaria leaves the snail, it undergoes a process called encystment, where it loses its tail and forms a cyst around itself. This encysted form is known as the metacercaria.

6. **Infection of the Primary Host**: The metacercaria is then ingested by the primary host (sheep), where it can infect the liver and mature into an adult fluke, thus completing the life cycle.

7. **Identifying the Correct Answer**: In the context of the question, the metacercaria of the liver fluke is best described as a "cyst stage" or "encysted stage" rather than a free-swimming or non-motile stage. Therefore, the correct answer is that the metacercaria is a **cyst stage**.

### Final Answer:
The metacercaria of the liver fluke is the **cyst stage**.

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