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.

Input: Consider Input: Category: BEFORE HE WAS PRESIDENT... 
Clue: He went to Stanford & became a mining engineer

Output: hoover


Input: Consider Input: Category: PREPOSITIONAL PHRASES 
Clue: This Bob Seger song gained commercial popularity in Chevy truck ads

Output: "like a rock"


Input: Consider Input: Category: OF THE ROMAN EMPIRE 
Clue: For walls & vaults, the Romans invented a superior type of this material made of cement, water & gravel


Output: concrete