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: fly, grasshopper, walk, waggle, train

A: train
****
Q: annoyed, detailed, well, fine, content

A: detailed
****
Q: sort mail, software, file, format, motherboard

A:
sort mail
****