Which ingredient is used to fill a Cherry Bomb?

The key ingredient used to fill a Cherry Bomb is Red Bull. This drink is typically created by dropping a shot of cherry-flavored vodka into a glass filled with Red Bull. The energy drink provides the characteristic fizz and unique flavor profile that complements the vodka, making it a popular choice for a shot and energy combination.

Cranberry juice, pineapple juice, and orange juice, while commonly used mixers in various cocktails, do not have the same energizing effect as Red Bull and are not traditionally associated with the Cherry Bomb drink. Therefore, Red Bull's distinct role in enhancing both the drink's flavor and its energy-boosting properties makes it the correct choice.