Which one of the following is correctly paired?

Options

A. Trygon = monitor
B. Varanus= crow
C. Corvus = sting ray
D. Icthyophis = limbless amphibian

Answer

To solve the question of which pair is correctly matched, we will analyze each option provided.

### Step-by-Step Solution:

1. **Examine Option 1: Trigon and Monitor Lizard**
- Trigon refers to the group of fish known as stingrays.
- Monitor lizards belong to a different category of reptiles.
- **Conclusion:** This pair is incorrectly matched.

2. **Examine Option 2: Wariness and Crew**
- Wariness does not correspond to "crew."
- Wariness is actually associated with monitor lizards.
- **Conclusion:** This pair is also incorrectly matched.

3. **Examine Option 3: Covers and Stingray**
- Covers does not relate to stingrays.
- The correct pairing would be stingray with Trigon.
- **Conclusion:** This pair is incorrectly matched.

4. **Examine Option 4: Ichthyophis and Limbless Amphibian**
- Ichthyophis is indeed a genus of limbless amphibians, commonly known as caecilians.
- This pairing is accurate as caecilians are recognized for their limbless body structure.
- **Conclusion:** This pair is correctly matched.

### Final Answer:
The correct answer is **Option 4: Ichthyophis and Limbless Amphibian**.