Endogamy is reported in

Options

A. Fasciola
B. Earthworm
C. Marchantia
D. Rabbit.

Answer

To solve the question "Endogamy is reported in," we will analyze the options provided and identify which organism exhibits the phenomenon of endogamy.

### Step-by-Step Solution:

1. **Understanding Endogamy**:
- Endogamy refers to the fusion of gametes that are derived from the same individual or parent. This means that the gametes are uniparental, coming from one organism rather than two different parents.

2. **Analyzing the Options**:
- **A. Fasciola**: This is a genus of parasitic flatworms, commonly known as liver flukes. They are hermaphrodites, meaning they possess both male and female reproductive organs. In Fasciola, the male and female gametes can fuse within the same organism, indicating endogamy.
- **B. Earthworm**: Earthworms are also hermaphrodites, but they typically engage in cross-fertilization rather than endogamy, as they exchange sperm with another earthworm.
- **C. Marchantia**: This is a genus of liverworts, which can reproduce sexually and asexually. However, they do not exhibit endogamy in the same manner as Fasciola.
- **D. Rabbit**: Rabbits are dioecious, meaning they have separate male and female individuals. They do not exhibit endogamy as they require two different parents for reproduction.

3. **Conclusion**:
- Based on the analysis, Fasciola is the organism that exhibits endogamy due to its hermaphroditic nature and the fusion of gametes from the same individual.

### Final Answer:
- The correct answer is **A. Fasciola**.