Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Q: Category: animals 
Words: duck, jog, cat, pig, mallet

A: jog
****
Q: Category: store status 
Words: shut, locked, near, out of service, close

A: near
****
Q: Category: ocean 
Words: history, current, sea, moon, flow

A:
history
****