TASK DEFINITION: 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.
PROBLEM: Category: chocolate food 
Words: brownies, falsification, fudge, rich, heavy

SOLUTION: falsification

PROBLEM: Category: animal 
Words: shark, dolphin, fish, hunting, cat

SOLUTION: hunting

PROBLEM: Category: consumer product 
Words: books, activity, excited, item, content

SOLUTION:
excited