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: consumer product 
Words: merchandise, happy, thing, content, service
answer:
happy


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


question:
Category: outdoor sport activity 
Words: hiking, fish, cow, row, camp
answer:

cow