Acoelmate animal with protansrous nature is

Options

A. Ascaris
B. Schistosoma
C. Taenia
D. Megascolex

Answer

To answer the question, "Acoelmate animal with protandrous nature is," we need to break down the terms and concepts involved.

### Step-by-Step Solution:

1. **Understand Acoelmate Animals**:
- Acoelmate animals are those that do not have a body cavity (coelom). They are solid-bodied organisms. Examples include flatworms (Phylum Platyhelminthes).

2. **Identify Protandrous Nature**:
- Protandry is a form of sequential hermaphroditism where an organism starts its life as a male and can later become female. This is common in some species of animals.

3. **Link Acoelmate and Protandrous**:
- Among acoelmate animals, the flatworms (especially certain species within the class Turbellaria or Trematoda) can exhibit protandrous characteristics.

4. **Conclusion**:
- Therefore, the answer to the question is that an example of an acoelmate animal with protandrous nature is **certain flatworms**.

### Final Answer:
An acoelmate animal with protandrous nature is **certain flatworms**.