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: aesthetic characteristic 
Words: comfortable, pretty, there, fine, classy

SOLUTION: comfortable

PROBLEM: Category: emotional status 
Words: fret, truss rod, emotional upsets, sad, worried

SOLUTION: truss rod

PROBLEM: Category: body part 
Words: centimeter, finger, arm, head, foot

SOLUTION:
centimeter