One of the following is absent in entamoeba histolytica

Options

A. Food vacuole
B. Pseudopodium
C. Contractile vacuole
D. Nucleus

Answer

### Step-by-Step Solution:

1. **Understanding Entamoeba histolytica**:
- Entamoeba histolytica is an anaerobic parasite that primarily infects the human intestine. It does not require oxygen for survival.

2. **Identifying the Structures**:
- The question asks which organ is absent in Entamoeba histolytica. We need to evaluate the given options:
- **Food Vacuole**: Present in many parasites and lower organisms for digestion.
- **Pseudopodium**: A structure used for movement, which is present in Entamoeba histolytica.
- **Contractile Vacuole**: A structure that expels excess fluid, typically found in aquatic protozoans.
- **Nucleus**: Present in all organisms as it contains genetic material.

3. **Analyzing the Options**:
- **Food Vacuole**: Present in Entamoeba histolytica for digestion.
- **Pseudopodium**: Present and used for locomotion.
- **Nucleus**: Present in Entamoeba histolytica as it is essential for all living cells.
- **Contractile Vacuole**: Absent in Entamoeba histolytica because it is a parasite that lives in the human intestine and not in an aquatic environment.

4. **Conclusion**:
- The correct answer is that the **contractile vacuole** is absent in Entamoeba histolytica.