Which beer style consists of fruit-flavored, moderately sour beers?

The choice of Lambics is accurate because this beer style is well-known for its unique fermentation process that incorporates wild yeasts and bacteria, particularly Brettanomyces and Lactobacillus. These microorganisms contribute to the sourness of the beer, which can vary from mildly tart to quite sour. Additionally, Lambics often include fruit, such as cherries (as in Kriek) or raspberries (as in Framboise), during or after fermentation, resulting in complex flavors and aromas that are both fruity and sour. This characteristic makes Lambics distinct from the other beer styles listed, which do not typically emphasize fruit flavors in the same sour manner.

Stouts are typically rich and dark beers with flavors of roasted malt and chocolate, lacking in the fruit-forward and sour qualities of Lambics. Pale Ales, known for their hop-forward profiles, showcase bitterness and citrus or pine notes rather than fruit-derived sourness. IPAs (India Pale Ales) focus on hoppy flavors and aromas, which can range from floral to tropical, but do not feature the sour and fruity profile that defines Lambics.