Nonpathogenic bacteria found in our vermiform appendix is

Options

A. Entamoeba histolytica
B. Shigella
C. Esherichia coli
D. Ascaris

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a non-pathogenic bacterium found in the vermiform appendix. It's important to identify what non-pathogenic means—these are bacteria that do not cause disease.

2. **Identifying Options**: The options provided are:
- Anthamoeba histolytica
- Shigella
- Escherichia coli
- Ascaris

3. **Analyzing Each Option**:
- **Anthamoeba histolytica**: This is a protozoan parasite known to cause amoebic dysentery, so it is pathogenic.
- **Shigella**: This is a genus of bacteria that causes shigellosis, which is a form of bacterial dysentery, making it pathogenic.
- **Escherichia coli (E. coli)**: This bacterium is commonly found in the intestines of humans and other animals. While some strains can be pathogenic, many strains are non-pathogenic and are part of the normal gut flora.
- **Ascaris**: This refers to a genus of parasitic worms (roundworms) that cause ascariasis, which is a disease, thus it is also pathogenic.

4. **Conclusion**: Among the options, Escherichia coli is the only one that is known to be non-pathogenic in the context of residing in the gut, including the vermiform appendix, where it can be part of the normal microbiota.

5. **Final Answer**: The non-pathogenic bacteria found in our vermiform appendix is **Escherichia coli** (E. coli).

---