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: kayak, raft, fish, canyoning, dolphin

Answer: dolphin


Question: Category: chocolate food 
Words: fudge, chocolate cake, pudding, unwarranted, heavy

Answer: unwarranted


Question: Category: social gathering 
Words: burger, cinema, team, club, bar

Answer:
burger