Acoelomate, triploblastic body with bilateral symmetry is characteristic of

Options

A. flatworms
B. roundworms
C. segmented worms
D. mollusc

Answer

To solve the question "Acoelomate, triploblastic body with bilateral symmetry is characteristic of," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Acoelomate**: Organisms that do not have a coelom (body cavity).
- **Triploblastic**: Organisms that have three germ layers: ectoderm, mesoderm, and endoderm.
- **Bilateral Symmetry**: Organisms that can be divided into two identical halves along one plane.

2. **Analyze the Options**:
- **Flatworm**: Known to be acoelomate, triploblastic, and exhibit bilateral symmetry.
- **Roundworm**: These are pseudocoelomates, meaning they have a body cavity but it is not completely lined with mesoderm.
- **Segmented Worm**: These are coelomates, meaning they have a true coelom.
- **Mollusk**: These are also coelomates and do not fit the criteria.

3. **Identify the Correct Answer**:
- Based on the definitions and characteristics, flatworms are the only organisms that fit all three criteria: they are acoelomate, triploblastic, and exhibit bilateral symmetry.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Flatworm**.