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.

[EX Q]: cold, deal, make the grade, unprejudiced, fair
[EX A]: unprejudiced

[EX Q]: current, flow, history, signal, jetstream
[EX A]: history

[EX Q]: protein, pasty, fat, thin, angular momentum
[EX A]:
protein