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: vitamin c, salt, sugar, fat, big boned
Example Output: big boned

Example Input: Category: emotional status 
Words: worried, angry, jack, fret, emotional upsets
Example Output: jack

Example Input: Category: military rank 
Words: sergeant, commander, sargent, regular, general
Example Output:
regular