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.

Category: temperature 
Words: cold, cool, icy, assured, mild
assured

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

Category: physical property 
Words: big boned, fat, skinny, vitamin c, chunky

vitamin c