Answer the following question given this paragraph: 

Radiation fog forms at night. Skies are clear, and the relative humidity is high. The ground cools as temperature goes down. Air near the ground cools below its dew point. Tule fog is an extreme form of radiation fog. This type of fog strikes the Central Valley of California in winter.


Q: What is the name of an extreme form of radiation fog?

 Choices:

- smelt fog

- aura fog

- cedar fog

- tule fog

A:
tule fog
