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.
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Question: Category: physical property 
Words: fat, vitamin c, area, brittleness, absorption

Answer: vitamin c


Question: Category: emotional status 
Words: down, emotional state, loveful, ashamed, flat

Answer: flat


Question: Category: temperature 
Words: assured, mild, refreshing, icy, cool

Answer:
assured