Choose the best answer.

___ is a brown fog that settles over major cities.
Haze
Smoke
Smog
Toxin
Drizzle

Choose the best answer.

___ is a brown fog that settles over major cities.
Haze
Smoke
Smog
Toxin
Drizzle

Smog

The best answer is:

Smog

The best answer to the given question is "Smog." Smog is a brown fog that typically forms over major cities as a result of air pollution, especially from vehicle emissions, industrial activities, and other sources. It is a combination of smoke, haze, and other pollutants that can have adverse effects on human health and the environment.

To arrive at this answer, you can eliminate the other options based on their definitions and characteristics.

- Haze is a term used to describe the reduced visibility caused by airborne particles, such as dust, smoke, or moisture, but it does not specifically refer to a brown fog settling over cities.
- Smoke refers to the visible gaseous products released by burning substances, but it typically does not settle as a fog over cities.
- Toxins are substances that are harmful or poisonous, but they do not necessarily cause a brown fog to settle over cities.
- Drizzle is a form of light, gentle rain, and it does not refer to a brown fog settling over cities.

Therefore, "Smog" is the most appropriate answer for the given question.