Entamoeba histolytica does not form cysts in

Options

A. Liver cells
B. Ascending colon
C. Transverse colon
D. Descending colon

Answer

### Step-by-Step Solution:

1. **Understanding the Organism**:
- Entamoeba histolytica is a unicellular eukaryotic organism that can exist in two forms: the infectious cyst and the invasive trophozoite.

2. **Defining Cysts**:
- A cyst is a relatively inactive form of the parasite that can survive for extended periods in the environment, particularly in soil or feces.

3. **Life Cycle of Entamoeba histolytica**:
- The life cycle begins when a person ingests the cyst through contaminated food or water.
- The cysts excyst in the small intestine, releasing trophozoites.

4. **Trophozoite Activity**:
- Trophozoites are the active form of the parasite that can invade tissues, such as the liver, and cause diseases like amoebic colitis.

5. **Cyst Formation**:
- Cysts are primarily formed in the colon of the large intestine after the trophozoites have invaded the intestinal lining.

6. **Identifying the Correct Answer**:
- The question asks where Entamoeba histolytica does not form cysts. Since cyst formation occurs in the colon, the correct answer is that it does not form cysts in the liver cells.

7. **Final Answer**:
- Therefore, the correct answer is: **Liver cells** (Option 1).