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: fat, calories, vitamin c, absorption, carbs

A: absorption
****
Q: ugly, absorption, vitamin c, fat, thin

A: vitamin c
****
Q: cow, horse, fish, hiking, goat

A:
hiking
****