which one of the following is an actively swmming free - living and nonfeeding stage of liverfluke

Options

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

Answer

To answer the question "Which one of the following is an actively swimming free-living and non-feeding stage of liver fluke?" we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the actively swimming, free-living, and non-feeding stage of the liver fluke.

2. **Reviewing the Options**:
- The options provided are:
- Sporocyst
- Redia
- Cercaria
- Mata Cercaria

3. **Analyzing Each Option**:
- **Sporocyst**: This is an early stage of the liver fluke that develops within the snail host after the miracidium stage. It is not free-living and does not swim actively.
- **Redia**: This is a larval stage produced within the sporocyst. It is not free-living and does not swim actively; rather, it develops within the host.
- **Cercaria**: This is the correct answer. The cercaria is a free-swimming larval stage of the liver fluke that emerges from the snail host. It is actively swimming and does not feed during this stage.
- **Mata Cercaria**: This refers to a tailless larval stage of certain trematodes. It is not actively swimming and is more of a cystic form that is typically not free-living.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Cercaria** as it is the actively swimming, free-living, and non-feeding stage of the liver fluke.

### Final Answer:
**Cercaria**