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: weather 
Words: cold, luke, fair, mild, light

Answer: light


Question: Category: secretary duty 
Words: answer calls, image, organize, file, correspondence

Answer: image


Question: Category: animal 
Words: leap, bike, swim, bee, fly

Answer:
bike