Entamoeba histolytica is

Options

A. Monogenetic
B. Digenetic
C. Free living
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understanding Entamoeba histolytica**:
- Entamoeba histolytica is a unicellular organism classified under the kingdom Protista. It is a type of protozoa.

2. **Identifying its Nature**:
- This organism is a parasite, meaning it relies on a host for its nutrition. In the case of Entamoeba histolytica, the primary host is humans.

3. **Location in Host**:
- Entamoeba histolytica primarily resides in the large intestine of humans, specifically in the mucosal and submucosal layers.

4. **Pathogenic Effects**:
- This parasite is pathogenic and is known to cause diseases such as dysentery, diarrhea, and hepatitis.

5. **Classification of Hosts**:
- Parasites can be classified based on the number of hosts they require.
- **Monogenetic**: Requires only one host.
- **Digenetic**: Requires two hosts.
- Since Entamoeba histolytica only requires humans as its host, it is classified as monogenetic.

6. **Evaluating the Options**:
- Given the options:
- A) Monogenetic
- B) Digenetic
- C) Free living
- D) None of the above
- The correct answer is A) Monogenetic, as it requires only one host (humans).

### Final Answer:
Entamoeba histolytica is **monogenetic**.

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