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.
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Question: Category: ocean 
Words: up to the moment, tide, current, jetstream, brine

Answer: up to the moment


Question: Category: weather 
Words: impartial, 70, warm, fair, luke

Answer: impartial


Question: Category: animal 
Words: fish, mice, dolphin, hunting, tiger

Answer:
hunting