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]: forward, opposite of up, unhappy, downward, down
[EX A]: unhappy

[EX Q]: club, hero, lettuce, bar, toast
[EX A]: bar

[EX Q]: fish, mice, row, kayak, canoe
[EX A]:
mice