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: activity 
Words: spend, divide, apple, whittle, fritter

Answer: apple


Question: Category: employment activity 
Words: fire, hire, ground, pay, retire

Answer: ground


Question: Category: emotional status 
Words: alert, custody, happy, fine, acceptable

Answer:
custody