Question: The private brewery Gaffel Becker & Co produces a beer brewed from mainly what?

full_context: Document 1: Pilsner: Pilsner (also pilsener or simply pils) is a type of pale lager. It takes its name from Plzeň (Pilsen in Czech Republic), a city in Bohemia, then in the Austrian Empire, now in the Czech Republic, where it was first produced in 1842. The world’s first blond lager, the original Pilsner Urquell, is still produced there today.
Document 2: Warsteiner: Warsteiner beer is brewed in the Arnsberg Forest Nature Park outside of Warstein, North-Rhine Westphalia, Germany. Warsteiner has been owned by the Cramer family since 1753. Warsteiner is Germany's largest privately owned brewery; its most popular beer is Warsteiner Premium Verum.
Document 3: Dortmunder Export: Dortmunder Export or Dortmunder is a pale lager originally brewed by Dortmunder Union in Dortmund, Germany, in 1873. A soft-textured beer influenced by the Pilsner lager brewed in Pilsen, it became popular with industrial workers and was responsible for Dortmunder Union becoming Germany's largest brewery and Dortmund having the highest concentration of breweries in Germany. With the decline of heavy industry in the area, the sales of Dortmunder also declined until, by 1994, the Dortmund Union brewery had shut down, and merged with several other Dortmund breweries to form Brinkhoff's Brewery.
Document 4: Helles: Helles or Hell is a traditional German pale lager beer, produced chiefly in Southern Germany, particularly Munich. The German word "hell" can be translated as "bright", "light", or "pale".
Document 5: Märzen: Märzen or Märzenbier (German: "March or March beer" , respectively) is a lager that originated in Bavaria. It has a medium to full body and may vary in color from pale through amber to dark brown.
Document 6: Beer in South Korea: Beer, called maekju (맥주 ; 麥酒 ) in Korean, was first introduced to Korea in the early 20th century. Seoul's first beer brewery opened in 1908. Two current major breweries date back to the 1920s. The third brewery established in Korea, Jinro Coors Brewery, was founded in the 1990s. It was later acquired by Oriental Breweries (OB). Hite Breweries's former name was Chosun Breweries, which was established in 1933. The company changed their name to Hite Breweries in 1998. OB Breweries established as Showa Kirin Breweries in 1933. The company changed their name to OB Breweries in 1995.
Document 7: A. Le Coq: A. Le Coq (] ) is an Estonian brewery. The company was founded by Albert Le Coq in London in 1807, using a brewery in Tartu that was founded in 1826. The company was bought in 1997 and is currently owned by Finnish company Olvi. It produces many different types of drinks including beers, long drinks, ciders and soft drinks. The best known beer is the A. Le Coq Premium, which is the most popular beer in Estonia, according to the latest AC Nielsen results in October 2008. A. Le Coq Arena in Tallinn was named after the beer.
Document 8: Heinrich Reissdorf: The private brewery Heinrich Reissdorf GmbH & Co. KG was founded in 1894 by Heinrich Reissdorf in Cologne. It produces a top-fermented beer called Reissdorf Kölsch.
Document 9: Kölsch (beer): Kölsch (] ) is a beer brewed in Cologne, Germany. It is a clear, top-fermented beer with a bright, straw-yellow hue similar to other beers brewed from mainly Pilsener malt.
Document 10: Rheingold Beer: Rheingold Beer, introduced in 1883, is a New York beer that held 35 percent of the state's beer market from 1950 to 1960. The company was sold by the founding German American Liebmann family in 1963. According to the "New York Times," "Rheingold Beer was once a top New York brew guzzled regularly by a loyal cadre of workingmen who would just as soon have eaten nails as drink another beer maker's suds." Its VP-Technical Joseph Owades claims credit for Rheingold's developing the first light beer.
Document 11: Fucking Hell: Fucking Hell is a German Pilsner or pale lager with an alcohol content of 4.9%. It is named after the village of Fucking in Austria; "hell" is the German word for 'pale' and a typical description of this kind of beer. The beer's name was initially controversial. Both the local authorities in Fucking and the European Union's Trade Marks and Designs Registration Office initially objected to the name. It was eventually accepted and the lager is now sold internationally.
Document 12: Gaffel Becker &amp; Co: The private brewery Gaffel Becker & Co was founded in 1908 by the Becker Brothers in Cologne. It produces a top-fermented beer called Gaffel Kölsch, which is a traditional regional style.
Document 13: Belle-Vue Brewery: Belle-Vue Brewery is a brewery founded in 1913 in Molenbeek, Brussels by Philémon Vandenstock from nearby Itterbeek, which lies in a region known for its lambic type of beer. Belle-Vue is now owned by Anheuser–Busch InBev. A variety of Belle-Vue lambic and fruit beers are produced at AB InBev's facilities located in Sint-Pieters-Leeuw.
Document 14: Brewery: A brewery or brewing company is a business that makes and sells beer. The place at which beer is commercially made is either called a brewery or a beerhouse, where distinct sets of brewing equipment are called plant. The commercial brewing of beer has taken place since at least 2500 BC; in ancient Mesopotamia, brewers derived social sanction and divine protection from the goddess Ninkasi. Brewing was initially a cottage industry, with production taking place at home; by the ninth century monasteries and farms would produce beer on a larger scale, selling the excess; and by the eleventh and twelfth centuries larger, dedicated breweries with eight to ten workers were being built.
Document 15: Bavaria Brewery (Colombia): Bavaria Brewery (Spanish: "Cervecería Bavaria" ), formally known as Bavaria S.A., is a Colombian brewery company founded on April 4, 1889 by Leo S. Kopp, a German immigrant. In 2005, Bavaria Brewery became a subsidiary of SABMiller. Before the merger, Bavaria was the second-largest brewery in South America.
ground_truth: Pilsener malt