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: weather 
Words: mild, warm, fine, fair, deal

SOLUTION: fine

PROBLEM: Category: type of sandwich 
Words: open-faced, team, roll, doorstep, club

SOLUTION: team

PROBLEM: Category: chocolate food 
Words: fudge, rich, pie, truffles, smear

SOLUTION:
smear