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.

Example Input: Category: physical property 
Words: fat, vitamin c, area, brittleness, absorption
Example Output: vitamin c

Example Input: Category: nutritional value 
Words: sugar, calories, iron, fat, area
Example Output: area

Example Input: Category: emotional status 
Words: there, alright, relaxed, fine, acceptable
Example Output:
there