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: social gathering 
Words: place, bar, doorstep, club, outing

SOLUTION: doorstep

PROBLEM: Category: emotional status 
Words: nervous, frustrated, fret, jack, concerned

SOLUTION: jack

PROBLEM: Category: chocolate food 
Words: heavy, chocolate, cake, mangle, fudge

SOLUTION:
mangle