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: animal 
Words: train, fly, jump, leap, grasshopper

SOLUTION: train

PROBLEM: Category: physical property 
Words: obese, fat, vitamin c, heavy, thin

SOLUTION: vitamin c

PROBLEM: Category: computers 
Words: reception, motherboard, file, space, firewall

SOLUTION:
reception