instruction:
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.
question:
Category: animals 
Words: duck, jog, cat, pig, mallet
answer:
jog


question:
Category: outdoor sport activity 
Words: whale, fish, raft, hiking, kayak
answer:
whale


question:
Category: chocolate food 
Words: fudge, chocolate, heavy, rich, loosen
answer:

loosen