instruction:
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.
question:
Category: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned
answer:
big boned


question:
Category: outdoor sport activity 
Words: hiking, climbing, mice, fish, row
answer:
mice


question:
Category: personal characteristic 
Words: freezing, assured, optimist, cool, relaxed
answer:

freezing