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: elements 
Words: ban, fire, combustion, ground, flame
answer:
ban


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


question:
Category: emotional display 
Words: pester, cub, culture, fawn, cute
answer:

cub