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: police punishment 
Words: prime, penalty, fine, mad, arrest

Answer: mad


Question: Category: activity 
Words: divide, fritter, dessert, whittle, spend

Answer: dessert


Question: Category: ocean 
Words: current, prompt, drink, course, wave

Answer:
prompt