Which beer style's IBU range is 18-25?

The correct answer is Festbier. This beer style typically has a moderate IBU range, and the 18-25 range fits well within its parameters. Festbier is a style that originated in Germany and is associated with the Oktoberfest celebration. It is characterized by its malty flavor profile, light golden color, and a smooth body, which allows the moderate hop bitterness to complement the malt sweetness rather than overpower it.

In this style, the balance between malt sweetness and hop bitterness is key, which is why the IBU range falls into the moderate category. The focus is often on creating a clean, drinkable beer that pairs well with a variety of foods common to festive occasions.

Understanding the attributes and IBU parameters of other beer styles can help clarify why they do not fit the 18-25 IBU range. For example, Märzen typically encompasses a slightly higher IBU range, while Kölsch is known for its mildly bitter characteristics that often sit lower on the IBU scale. Czech Amber Lager, also, tends to have a broader IBU range but can reach higher bitterness levels than Festbier.