Which one of the following is a matching pair of a body feature and the animal possessing it ?

Options

A. Ventral heart : Scorpion
B. Post-anal tail : Octopus
C. Ventral, Central nervous system : Leech
D. Pharyngeal gill : Chamaeleon

Answer

To solve the question of identifying the matching pair of a body feature and the animal possessing it, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Question**: We need to find a correct pair of a body feature and the corresponding animal that possesses it.

2. **Analyze Option A: Ventral Heart in Scorpion**:
- Scorpions belong to the phylum **Arthropoda**.
- In arthropods, the heart is typically **dorsal**, not ventral.
- **Conclusion**: This option is incorrect.

3. **Analyze Option B: Post Anal Tail in Octopus**:
- Octopuses belong to the phylum **Mollusca**.
- Mollusks do not have a **post anal tail**; it is absent in this group.
- **Conclusion**: This option is incorrect.

4. **Analyze Option C: Ventral Central Nervous System in Leech**:
- Leeches belong to the phylum **Annelida**.
- In annelids, the central nervous system is indeed **ventral**.
- **Conclusion**: This option is correct.

5. **Analyze Option D: Pharyngeal Gill Slits in Chameleon**:
- Chameleons belong to the phylum **Chordata**.
- In chordates, **pharyngeal gill slits** are present during some stage of development.
- **Conclusion**: This option is also correct.

6. **Final Conclusion**:
- Both options C (Ventral Central Nervous System in Leech) and D (Pharyngeal Gill Slits in Chameleon) are correct.
- Therefore, the answer is **C and D**.