Explanation:

- Option 1: Fungi

- Fungi are responsible for infections like athlete’s foot and ringworm, but not cholera.

- Option 2: Bacteria

- Cholera is indeed caused by the bacterium *Vibrio cholerae*.

- It spreads through contaminated water or food.

- Symptoms include severe diarrhea and dehydration.

- Correct Answer

- Option 3: Protozoa

- Protozoal infections are typically parasitic, like malaria and amoebiasis.

- They do not cause cholera.

- Option 4: Virus

- Viral infections include illnesses like the common cold and flu.

- No viruses are responsible for cholera.