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: VIDEO GAME HISTORY 
Clue: id Software says hardcore PC games went mainstream in 1994 when it unleashed this fatal-sounding game
doom

Category: AROUND THE U.S.A. 
Clue: Any Texan can tell you that this city is "Big D"
dallas

Category: CHICKS WITH BICS 
Clue: Mary Poppins was created by this Australian author whose initials stood for Pamela Lyndon

p.l. travers