A post-anal tail is found in

Options

A. Earthworm
B. Lower invertebrate
C. Scorpion
D. Snake

Explanation

To answer the question "A post-anal tail is found in," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Term "Post-Anal Tail":**
- A post-anal tail is an extension of the body that is found behind the anus. It is a characteristic feature of certain animal groups, particularly in the phylum Chordata.

2. **Identifying Animal Groups with Post-Anal Tails:**
- Post-anal tails are typically found in members of the phylum Chordata, which includes vertebrates (like mammals, birds, reptiles, amphibians, and fish) as well as some invertebrates (like tunicates).

3. **Focusing on Reptiles:**
- The question specifies a particular group, and the video transcript mentions that post-anal tails are found in snakes, which belong to the class Reptilia.

4. **Confirming the Class Reptilia:**
- Snakes are reptiles, and reptiles are known to have a post-anal tail during some stage of their development. This feature is also common in other reptiles, but the question specifically highlights snakes.

5. **Conclusion:**
- Based on the information provided, the correct answer to the question is that a post-anal tail is found in snakes.

### Final Answer:
A post-anal tail is found in **snakes**.

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