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, prime, firstrate, custody, ok

A: ok
****
Q: neat, beautiful, dull, fine, firstrate

A: firstrate
****
Q: lie, brownies, fudge, unwarranted, replace

A:
brownies
****