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]: lifeline, knockout, deck, punch, tko
[A]: lifeline


[Q]: fret, nervous, board, fingerpick, jack
[A]: nervous


[Q]: heavy, fat, skinny, calories, ugly
[A]:
calories