TASK DEFINITION: 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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: HEY, BEAUTIFUL 
Clue: She auditioned for the role of Cordelia on "Buffy the Vampire Slayer" but won the title role instead

SOLUTION: sarah michelle gellar

PROBLEM: Category: DAVID BOWIE 
Clue: The film "2001" inspired this song heard here:

SOLUTION: "space oddity"

PROBLEM: Category: THE 17th CENTURY 
Clue: A royal observatory was founded in this London borough in 1675

SOLUTION:
greenwich