Which one of the following life cycle stage of liver Fluke is infective to the intermediate host

Options

A. Metacercaria
B. Miracidia
C. Sporocyst
D. Cercaria

Answer

To answer the question "Which one of the following life cycle stage of liver Fluke is infective to the intermediate host?", we need to understand the life cycle of the liver fluke (Fasciola hepatica) and identify the stage that infects the intermediate host.

### Step-by-Step Solution:

1. **Identify the Life Cycle of Liver Fluke**:
- The liver fluke has a complex life cycle that involves multiple stages and hosts. The primary host is usually a mammal, such as sheep or cattle, while the intermediate host is typically a freshwater snail.

2. **Stages of the Liver Fluke**:
- The life cycle includes several stages:
- Eggs
- Miracidium (free-swimming larval stage)
- Sporocyst (develops within the snail)
- Redia (another larval stage within the snail)
- Cercaria (another free-swimming larval stage)
- Metacercaria (encysted stage on vegetation)
- Adult fluke (in the liver of the definitive host)

3. **Identify the Infective Stage for the Intermediate Host**:
- The stage that is infective to the intermediate host (the snail) is the **Miracidium**. This is the larval stage that hatches from the egg and seeks out the snail to continue its development.

4. **Conclusion**:
- Therefore, the correct answer to the question is that the **Miracidium** stage of the liver fluke is infective to the intermediate host.

### Final Answer:
The life cycle stage of the liver fluke that is infective to the intermediate host is the **Miracidium**.

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