Why does sprite react when mentos are put in it?

When Mentos are added to Sprite, a rapid reaction occurs due to the rough surface of the candies, which provides numerous nucleation sites for carbon dioxide bubbles. As the carbon dioxide gas escapes from the liquid, it forms bubbles that quickly rise to the surface, causing an eruption of foam. The reaction is enhanced by the sugar and carbonation in Sprite, leading to an impressive geyser effect. This phenomenon is primarily a physical reaction rather than a chemical one.