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: type of rigidity 
Words: unbending, unyielding, inflexible, firm, streamline
answer:
streamline


question:
Category: aesthetic characteristic 
Words: honorable, fair, variety, milky, even
answer:
honorable


question:
Category: computers 
Words: folder, image, file, prepare, keys
answer:

prepare