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: nutritional value 
Words: fat, protein, vitamin c, fiber, area

SOLUTION: area

PROBLEM: Category: elements 
Words: let go, flame, inferno, fire, water

SOLUTION: let go

PROBLEM: Category: elements 
Words: ground, fire, ban, combustion, water

SOLUTION:
ban