Which one is correctly matched ?
`{:(,"Animal" , "Characteristic" , "Taxon") , ((A) , "Millipede" , "Ventral nerve cord" , "Arachnida"),((B), "Silver fish" , "Pectoral and pelvic fins" , "Chordata"),((C), "Duck - billed Platypus" , "Oviparous" , "Mammalia"), ((D) , "Sea Anemous" , "Triploblastic" , "Cnidaria"):}`

Answer

To determine which option is correctly matched, we will analyze each option based on the given characteristics and taxonomic classifications.

### Step-by-Step Solution:

1. **Option A: Millipede - Ventral nerve cord - Arachnida**
- Millipedes belong to the class **Diplopoda**, not **Arachnida**.
- They have a **ventral nerve cord**, which is correct for many arthropods, but since the taxon is incorrect, this option is **wrong**.

2. **Option B: Silverfish - Pectoral and pelvic fins - Chordata**
- Silverfish are **not** fish; they are insects belonging to the order **Thysanura** within the phylum **Arthropoda**.
- They do not have **pectoral and pelvic fins**, which are characteristics of fish in the phylum **Chordata**. Therefore, this option is also **wrong**.

3. **Option C: Duck-billed Platypus - Oviparous - Mammalia**
- The duck-billed platypus is indeed **oviparous**, meaning it lays eggs.
- It belongs to the class **Mammalia**, which includes egg-laying mammals known as monotremes. This option is **correct**.

4. **Option D: Sea Anemone - Triploblastic - Cnidaria**
- Sea anemones are classified under **Cnidaria** and are **diploblastic**, meaning they have two germ layers (ectoderm and endoderm).
- The statement that they are **triploblastic** (having three germ layers) is incorrect. Therefore, this option is also **wrong**.

### Conclusion:
The only correctly matched option is **Option C: Duck-billed Platypus - Oviparous - Mammalia**.

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