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: fine, classy, mad, happy, relaxed

A: classy
****
Q: egret, crane, goose, dump truck, duck

A: dump truck
****
Q: mad, comfortable, fine, detached, dull

A:
dull
****