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: bird 
Words: dump truck, pelican, goose, crane, derrick

Answer: dump truck


Question: Category: mode of transportation 
Words: train, spider, wave, fly, drive

Answer: spider


Question: Category: food 
Words: sausage, hot dog, concise, frank, weenie

Answer:
concise