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: current, wave, whirlpool, sea, data sets

A: data sets
****
Q: pastry, dunker, fritter, blow, cake

A: blow
****
Q: tone, fair, make the grade, sunny, brisk

A:
tone
****