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: police punishment 
Words: prime, penalty, fine, mad, arrest
answer:
mad


question:
Category: physical property 
Words: bulky, angular momentum, pasty, fat, big
answer:
big


question:
Category: boats 
Words: fight, head, dock, deck, gunwale
answer:

fight