What is the purpose of the foghorn in a lighthouse?

What is the purpose of the foghorn in a lighthouse?

A Communicate with nearby lighthouses
B Illuminate the surroundings
C Warn ships of nearby land

A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards in foggy conditions. All foghorns use a vibrating column of air to create an audible tone.

The correct answer is Warn ships of nearby land.

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