Which of the following is not a coelentrate ?

Options

A. sea fan
B. Sea pen
C. Sea feather
D. Sea gooseberry

Answer

To determine which of the following options is not a coelentrate (cnidarian), we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Coelentrates**: Coelentrates, also known as cnidarians, are a phylum of animals that include organisms like jellyfish, corals, and sea anemones. They are characterized by their stinging cells called cnidoblasts.

2. **Identifying the Options**:
- **Option A: Sea Fan (C-Fan)**: This is a type of coral and belongs to the phylum Cnidaria.
- **Option B: Sea Pen (C-Pen)**: This is also a type of colonial cnidarian and belongs to the phylum Cnidaria.
- **Option C: Sea Feather (C-Feather)**: This is a type of organism that is classified under Echinodermata, not Cnidaria.
- **Option D: Sea Gooseberry (C-Gooseberry)**: This organism belongs to the phylum Ctenophora, which is distinct from Cnidaria.

3. **Conclusion**:
- From the analysis, both the Sea Feather (C-Feather) and Sea Gooseberry (C-Gooseberry) do not belong to the phylum Cnidaria (coelentrates).
- Therefore, the correct answer to the question "Which of the following is not a coelentrate?" is **C-Feather and C-Gooseberry**.

### Final Answer:
C-Feather and C-Gooseberry are not coelentrates.

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