Which of the following has an IBU range of 25-50?

Altbier has an IBU range of 25-50, which reflects its balanced profile of malt and hop bitterness. This style typically features a moderate bitterness that enhances the malt character without overpowering it. The slight bitterness in Altbier comes from its use of noble hop varieties, which are known for their mild flavor profiles.

Kellerbier, Dunkels Bock, and Schwarzbier usually have lower IBU values, staying more in the range of 15-30, as they focus more on malt sweetness and character rather than hop-forward bitterness. Understanding the IBU range is crucial for identifying and appreciating different beer styles, and it helps in pairing and serving recommendations based on bitterness levels.