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: nutritional value 
Words: heavy, fat, protein, obese, carbs
Example Output: obese

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

Example Input: Category: shady activities 
Words: fix, rich, unwarranted, falsification, fudge
Example Output:
rich