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

Options

A. Ventral central nervous system - Leech
B. Pharyngeal gill slits absent in embryo- Chameleon
C. Ventral heart - Scorpion
D. Post-anal tail - Octopus

Explanation

To solve the question, "Which one of the following is a matching pair of a body feature and the animal possessing it?", we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The question presents several pairs of animals and their respective body features. We need to evaluate each pair to determine if they match correctly.

2. **Evaluate the First Option**:
- **Animal**: Leech
- **Body Feature**: Ventral central nervous system
- **Analysis**: Leeches do possess a ventral nervous system. Therefore, this pair is correct.

3. **Evaluate the Second Option**:
- **Animal**: Scorpion
- **Body Feature**: Dorsal heart
- **Analysis**: Scorpions actually have a dorsal heart, so this pair is also correct.

4. **Evaluate the Third Option**:
- **Animal**: Chameleon
- **Body Feature**: Pharyngeal gill slits
- **Analysis**: Chameleons, being chordates, do have pharyngeal gill slits during their embryonic stage. This pair is correct.

5. **Evaluate the Fourth Option**:
- **Animal**: Octopus
- **Body Feature**: Post-anal tail
- **Analysis**: Octopuses are non-chordates and do not possess a post-anal tail. This pair is incorrect.

6. **Conclusion**: The correct matching pairs are:
- Leech with ventral central nervous system
- Scorpion with dorsal heart
- Chameleon with pharyngeal gill slits
- The incorrect pair is Octopus with post-anal tail.

### Final Answer:
The correct matching pair of a body feature and the animal possessing it is:
- **Leech with ventral central nervous system**.