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: outdoor sport activity 
Words: fish, hiking, row, shark, canoe

Answer: shark


Question: Category: animal 
Words: cockroach, leap, drive, swim, fly

Answer: drive


Question: Category: secretary duty 
Words: file, order office supplies, folder, answer, prepare

Answer:
folder