Cicerone Certified Beer Server Practice Test

Beer is primarily composed of water, comprising over 90% of its weight. While hops and malt are important components, especially for flavoring, they make up a much smaller percentage by weight compared to water. Yeast is also an important ingredient in the brewing process, but it is typically added in small amounts and does not make up a significant portion of the final product's weight. Therefore, water is the correct answer as it constitutes the majority of beer by weight.