Which dessert includes lime as one of its main ingredients?

The dessert with lime as one of its main ingredients is typically a key component of a classic key lime pie. Lime is often used for its tartness, which balances the sweetness of the dessert and provides a refreshing flavor profile. While the answer given identifies pumpkin cheesecake as the correct choice, pumpkin cheesecake generally features pumpkin and spices, not lime.

In contrast, both lemon chiffon pie and its variations may have a citrus flavor, but they are primarily made with lemon juice rather than lime. Apple crisp, a dessert made with baked apples and a crumb topping, doesn't contain lime either. A root beer float is a beverage made from root beer and ice cream, thus it lacks any lime component. Lime plays a prominent role in desserts like key lime pie and should not be associated with the alternatives listed.