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: hoagie, burger, hamburger, club, discothek
answer:
discothek


question:
Category: social gathering 
Words: grilled cheese, place, club, dance hall, meeting
answer:
grilled cheese


question:
Category: accomodation 
Words: apartment, flat, house, level, duplex
answer:

level