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.

[EX Q]: Category: chocolate food 
Words: brownie, loosen, chocolate cake, fudge, molasses
[EX A]: loosen

[EX Q]: Category: physical property 
Words: large, obese, fat, chunky, fiber
[EX A]: fiber

[EX Q]: Category: emotional status 
Words: neck, fret, emotionalities, emotional supports, sad
[EX A]:
neck