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: social gathering 
Words: place, club, outing, lettuce, group
answer:
lettuce


question:
Category: consumer product 
Words: content, panicked, file, substance, jewelry
answer:
panicked


question:
Category: measurement unit 
Words: foot, kilometer, milimeter, pound, elbow
answer:

elbow