instruction:
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.
question:
Category: type of sandwich 
Words: club, roll, doorstep, discothek, toast
answer:
discothek


question:
Category: boats 
Words: chips, crew, bow, deck, bridge
answer:
chips


question:
Category: bird 
Words: goose, crane, hoist, ostrich, digger
answer:

digger