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: corporate 
Words: synergy, combined, concerted, resistant, firm
answer:
resistant


question:
Category: consumer product 
Words: happy, service, content, program, books
answer:

happy