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: physical property 
Words: fat, vitamin c, area, brittleness, absorption
answer:
vitamin c


question:
Category: consumer product 
Words: shop, tools, happy, service, content
answer:
happy


question:
Category: aesthetic characteristic 
Words: level, impartial, fair, tone, cool
answer:

impartial