During its life cycle fasciola heptica (Liver fluke) Infects its intermadiate host and primary host at the following larval stages respectively

Options

A. Redia and miracidium
B. Cercaria and redia
C. Metacercaria and carcaria
D. Miracidium and metacercaria

Answer

To answer the question regarding the larval stages of Fasciola hepatica (Liver fluke) that infect its intermediate and primary hosts, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Hosts**:
- The primary host of Fasciola hepatica is typically sheep or goats.
- The intermediate host is a snail.

2. **Understand the Life Cycle**:
- Fasciola hepatica undergoes several larval stages during its life cycle.
- The life cycle includes the release of larvae from the primary host into the environment.

3. **Identify the Larval Stages**:
- The first larval stage that infects the intermediate host (snail) is called **Miracidium**. This larva is free-swimming and seeks out the snail to infect it.
- The second larval stage that infects the primary host (sheep or goat) is known as **Metacercaria**. This stage develops after the larva has gone through several transformations, including the Cercaria stage, and forms cysts.

4. **Conclusion**:
- Therefore, the correct answer to the question is:
- **Intermediate host (snail) is infected by Miracidium**.
- **Primary host (sheep/goat) is infected by Metacercaria**.

### Final Answer:
- Intermediate Host: **Miracidium**
- Primary Host: **Metacercaria**

---