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: sugars, fat, protein, skinny, iron

A: skinny
****
Q: data sets, sea, prompt, timely, current

A: sea
****
Q: anxious, fret, sad, strap lock, frustrated

A:
strap lock
****