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: physical activity 
Words: dog, push, duck, squat, jog

Answer: dog


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

Answer: bike


Question: Category: chocolate food 
Words: replace, pie, fudge, chocolate, rich

Answer:
replace