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: dump truck, tackle, crane, duck, mallet

A: dump truck
****
Q: iguana, mice, climbing, fish, hamster

A: climbing
****
Q: french toast, submarine, club, convention, hero

A:
convention
****