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: swallow, heron, crane, flamingo, tackle

A: tackle
****
Q: emotional upsets, pick, emotional state, fret, emotional supports

A: pick
****
Q: dull, prime, hot, bright, fine

A:
prime
****