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: secretary duty 
Words: answer calls, image, organize, file, correspondence

SOLUTION: image

PROBLEM: Category: type of sandwich 
Words: submarine, burger, bar, lettuce, club

SOLUTION: bar

PROBLEM: Category: animal 
Words: mice, bat, dolphin, canyoning, fish

SOLUTION:
canyoning