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.

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

Category: BEER 
Clue: Lambic beer, fermented by wild yeasts, is mainly made in this Low Country
belgium

Category: ISLANDS 
Clue: These islands famous for their ponies form the northernmost part of Scotland

the shetlands