Symbiotic bacteria present in intestine of most primates, which synthesize certain vitamins are

Options

A. Entamoeba histolytica
B. Entamoeba coli
C. Entamoeba gingivalis
D. None of these

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about symbiotic bacteria found in the intestines of most primates that synthesize certain vitamins.

2. **Identifying Symbiotic Bacteria**: Symbiotic bacteria are those that live in a mutualistic relationship with their host, providing benefits to both. In the case of primates, these bacteria help in the synthesis of vitamins.

3. **Reviewing the Options**: The options provided are:
- A) Entamoeba histolytica
- B) Endomibaculum
- C) Endomibaginzivalis
- D) None of these

4. **Analyzing Each Option**:
- **Entamoeba histolytica**: This is a known pathogenic parasite that causes amoebic dysentery and is not involved in vitamin synthesis.
- **Endomibaculum**: This is not a recognized name in the context of symbiotic bacteria in primates.
- **Endomibaginzivalis**: This is also a pathogenic organism and does not synthesize vitamins.
- **None of these**: This option suggests that none of the above are correct.

5. **Identifying the Correct Bacteria**: The most common symbiotic bacteria in the intestines of primates that synthesize vitamins, particularly B12 and K, is **Escherichia coli** (often referred to as E. coli). However, none of the provided options directly mention E. coli.

6. **Conclusion**: Since the question specifically asks for the bacteria that synthesize vitamins in the intestines of primates, and the closest option that relates to a common colon bacterium is **Endomibaculum**, which is not a standard name, we conclude that the best answer is **None of these** because the correct bacteria (E. coli) is not listed.

**Final Answer**: D) None of these

---