Choose the correct statement:

Options

A. Filariasis occurs by Trichoderma
B. Housefly is the vector of amoebiasis
C. Culex acts as vector for malaria
D. Ascariasis occurs by droplet infection

Answer

To solve the question "Choose the correct statement," we need to evaluate each of the provided statements regarding human diseases and their vectors.

### Step-by-Step Solution:

1. **Evaluate Statement 1**: "Housefly acts as a vector of amoebiasis."
- This statement is **true**. The pathogen causing amoebiasis is *Entamoeba histolytica*, and houseflies can carry this pathogen from feces to food, thus acting as a vector.

2. **Evaluate Statement 2**: "Amoebiasis acts as a vector of pathogen."
- This statement is **incorrect**. Amoebiasis is a disease caused by a pathogen (*Entamoeba histolytica*), but it does not act as a vector itself.

3. **Evaluate Statement 3**: "Culex acts as a vector for Malaria."
- This statement is **incorrect**. The correct vector for malaria is the female Anopheles mosquito, not Culex.

4. **Evaluate Statement 4**: "Ascariasis occurs by droplet infection."
- This statement is **incorrect**. Ascariasis is caused by the ingestion of eggs of the roundworm *Ascaris lumbricoides*, not through droplet infection.

5. **Conclusion**: The only correct statement among the options is the first one: "Housefly acts as a vector of amoebiasis."

### Final Answer:
The correct statement is: **"Housefly acts as a vector of amoebiasis."**

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