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: elements 
Words: pay, cool, combustion, air, fire
answer:
pay


question:
Category: emotional status 
Words: fine, relaxed, comfortable, prime, content
answer:
prime


question:
Category: mode of transportation 
Words: fly, car, jump, bus, bike
answer:

jump