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: baby animals 
Words: cub, identity, buck, fawn, kid
identity

Category: mode of transportation 
Words: bus, fly, jog, beetle, drive
beetle

Category: police punishment 
Words: money, content, penalty, fine, jail time

content