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: current, timely, prompt, drink, do tests

A: drink
****
Q: fair, endure, mild, color, tangle

A: color
****
Q: dog, hunting, hike, fish, swim

A:
dog
****