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: physical property 
Words: fat, vitamin c, area, brittleness, absorption

SOLUTION: vitamin c

PROBLEM: Category: animal 
Words: swim, dive, fly, car, bee

SOLUTION: car

PROBLEM: Category: animal 
Words: bee, fly, run, bus, leap

SOLUTION:
bus