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: ostrich, digger, sandpiper, crane, goose

Answer: digger


Question: Category: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned

Answer: big boned


Question: Category: alcoholic drinks 
Words: gin, wine, beer, vodka, hearts

Answer:
hearts