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.

Category: physical activity 
Words: bend, jog, get down, duck, pig
pig

Category: chocolate food 
Words: cake, fudge, rich, invent, cream
invent

Category: police punishment 
Words: jail time, beautiful, fine, jail, ticket

beautiful