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: aesthetic characteristic 
Words: fair, medium, size, light, loyal
answer:
loyal


question:
Category: social gathering 
Words: place, club, outing, lettuce, group
answer:
lettuce


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

mice