You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: OH "BOY" 
Clue: Slang term for an American infantryman of WWI
doughboy

Category: AKA 
Clue: Helen Louise Leonard got this stage name from Tony Pastor and her diamonds, we assume, from Jim Brady
lillian russell

Category: AN IRISH PUB QUIZ 
Clue: This Dublin brewer dating back to 1759 says its draught elixir is best served at 43 degrees Fahrenheit

guinness