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: measurement unit 
Words: meter, inch, foot, heel, pound
answer:
heel


question:
Category: physical property 
Words: brittleness, protein, bulky, skinny, fat
answer:
protein


question:
Category: personal characteristic 
Words: freezing, positive, cool, classy, assured
answer:

freezing