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: corporate 
Words: unyielding, concerted, firm, combined, united

Answer: unyielding


Question: Category: direction 
Words: down, lower, emotional upsets, below, falling

Answer: emotional upsets


Question: Category: animal 
Words: mice, trap, dog, fish, stingray

Answer:
trap