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: social gathering 
Words: picnic, french toast, clan, club, bar

Answer: french toast


Question: Category: police punishment 
Words: wispy, fine, probation, calm, prime

Answer: calm


Question: Category: bird 
Words: derrick, crane, neck, swallow, winch

Answer:
derrick