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: fat, ugly, sugar, salt, protein

A: ugly
****
Q: bats, pounce, cockroach, bike, fly

A: bike
****
Q: clan, club, discothek, meeting, blt

A:
blt
****