Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

[Q]: heat, hire, burn, air, fire
[A]: hire


[Q]: current, history, wave, jetstream, whirlpool
[A]: history


[Q]: sausage, frank, brash, stern, matter of fact
[A]:
sausage