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: signal, sea, current, drink, belated

A: belated
****
Q: jack, string, crying, neck, fret

A: crying
****
Q: locked, barred, not open, on top of, close

A:
on top of
****