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: EXPRESSIONS 
Clue: This positive expression used since the 1940s promotes a type of stove

SOLUTION: "now you\'re cooking with gas"

PROBLEM: Category: GOVERNMENT & POLITICS 
Clue: He's the current president of the Senate

SOLUTION: al gore

PROBLEM: Category: POP MUSIC 
Clue: '60s Dylan classic that begins, "Once upon a time you dressed so fine"

SOLUTION:
"like a rolling stone"