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: prison, mad, arrest, fine, wispy

A: mad
****
Q: concrete pourer, winch, excavator, hoist, crane

A: hoist
****
Q: fair, fine, well, alright, light

A:
light
****