instruction:
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: aesthetic characteristic 
Words: well, milky, variety, tone, fair
answer:
well


question:
Category: chocolate food 
Words: replace, fudge, cupcake, heavy, cream
answer:
replace


question:
Category: secretary duty 
Words: prepare, firewall, correspondence, organize, file
answer:

firewall