The organisms belonging to following phylum are (true) coelomate

Options

A. Arthropoda
B. Aschelminthes
C. Ctenophora
D. Platyhelminthes

Answer

To determine which organisms belong to the phylum that are true coelomates, we need to analyze the options provided in the question. Let's go through the organisms step by step:

1. **Arthropoda**:
- Arthropods are indeed true coelomates. They possess a true coelom, which is a body cavity completely lined by mesoderm. This allows for the development of complex organ systems and greater body organization. Examples include insects, arachnids, and crustaceans.

2. **Aschelminthes (or Nematoda)**:
- Aschelminthes, commonly known as roundworms, are classified as pseudocoelomates. They have a body cavity (pseudocoel) that is not completely lined with mesoderm; hence, they do not qualify as true coelomates.

3. **Ctenophora**:
- Ctenophores, also known as comb jellies, do not have a true coelom. They possess a simple body structure without a coelomic cavity, making them not true coelomates.

4. **Platyhelminthes**:
- Platyhelminthes, or flatworms, are acoelomates, meaning they lack a body cavity altogether. Therefore, they do not qualify as true coelomates.

Based on this analysis, the only phylum that contains true coelomates from the options provided is **Arthropoda**.

### Final Answer:
The organisms belonging to the phylum **Arthropoda** are true coelomates.

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