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: animal 
Words: bird, fish, fly, drive, eagle
answer:
drive


question:
Category: employment activity 
Words: recruit, replace, sack, heat, fire
answer:
heat


question:
Category: aesthetic characteristic 
Words: milky, 70, size, even, fair
answer:

70