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.
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Question: Category: CLASSICAL MYTHOLOGY 
Clue: Some say this underworld canine has serpents entwined around his multiple necks

Answer: cerberus


Question: Category: LITERATURE 
Clue: Poet who wrote, "Before I built a wall I'd ask to know what I was walling in or walling out"

Answer: robert frost


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

Answer:
al gore