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: MOVIE SONGS 
Clue: "Nobody Does It Better" (1977)
the spy who loved me

Category: LETHAL WEAPONS 
Clue: In the largest man-made explosion in history, the USSR detonated a 50-megaton one of these in 1961
a hydrogen bomb

Category: INITIALLY BEFORE & AFTER 
Clue: This outbreak prevention agency & broadcaster wows 'em with the "Late Show with David Letterman"

cdcbs