Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: emotional status 
Words: down, emotional upsets, disgusted, shameful, sliding
sliding

Category: animal 
Words: ant, walk, bike, fly, dangle
bike

Category: ocean 
Words: drink, current, whirlpool, late, brine

late