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: geographical property 
Words: mountain, flat, hill, mansion, plain
answer:
mansion


question:
Category: food 
Words: fortitude, meat, cheese, frank, pork
answer:
fortitude


question:
Category: aesthetic characteristic 
Words: unjust, fair, variety, tone, light
answer:

unjust