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What sign can indicate oxidation in beer?

  1. Fruity flavors

  2. Cardboard flavors

  3. Highly carbonated finish

  4. Floral aroma

The correct answer is: Cardboard flavors

Choosing "cardboard flavors" as the sign of oxidation in beer is correct because oxidation often leads to the development of undesirable flavors that resemble wet cardboard or paper. This off-flavor is a result of the chemical reactions occurring when oxygen interacts with the beer over time, affecting its freshness and overall flavor profile. In contrast, fruity flavors are typically associated with certain yeast strains or hop varieties and are not indicative of oxidation. A highly carbonated finish does not suggest oxidation; rather, it refers to the level of carbonation in the beer, which can be influenced by various brewing and fermentation processes. Floral aromas are generally related to fresh hops or specific malt characteristics, and while important, they do not signal oxidation.