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.
--------
Question: Category: nutritional value 
Words: iron, heavy, vitamin c, fat, brittleness

Answer: brittleness


Question: Category: emotional status 
Words: concerned, board, nervous, emotional, fret

Answer: board


Question: Category: store status 
Words: out of service, close, gated, nearer, shut

Answer:
nearer