Context:  The strength of beers has climbed during the later years of the 20th century. Vetter 33, a 10.5% abv (33 degrees Plato, hence Vetter "33") doppelbock, was listed in the 1994 Guinness Book of World Records as the strongest beer at that time, though Samichlaus, by the Swiss brewer Hürlimann, had also been listed by the Guinness Book of World Records as the strongest at 14% abv. Since then, some brewers have used champagne yeasts to increase the alcohol content of their beers. Samuel Adams reached 20% abv with Millennium, and then surpassed that amount to 25.6% abv with Utopias. The strongest beer brewed in Britain was Baz's Super Brew by Parish Brewery, a 23% abv beer. In September 2011, the Scottish brewery BrewDog produced Ghost Deer, which, at 28%, they claim to be the world's strongest beer produced by fermentation alone.

Question: How much alcohol is contained in the beer Vetter 33?
Answer: 10.5%

Question: What was the strongest beer in 1994 according to the Guinness Book of World Records?
Answer: Vetter 33

Question: What brewing company produced the beer Millennium?
Answer: Samuel Adams

Question: What year did the brewing company BrewDog start producing a beer called Ghost Deer?
Answer: 2011

Question: What do brewing companies sometimes use to give more alcohol content to their beer?
Answer: champagne yeasts

Question: What beer has a 10.5% volume by alcohol? 
Answer: Unanswerable

Question: What was the strongest beer in the 1949 Guinness Book of World Records?
Answer: Unanswerable

Question: What percentage abv did Adams Samuel first reach by using champagne yeasts?
Answer: Unanswerable

Question: What was the abv of Utopias that was brewed in Britain? 
Answer: Unanswerable

Question: What was produced in September of 2001?
Answer: Unanswerable