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]: streamline, sustainability, private, firm, stiff
[A]: stiff


[Q]: crane, pelican, egret, hummingbird, upraise
[A]: upraise


[Q]: up to the moment, brine, data sets, current, belated
[A]:
brine