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: type of rigidity 
Words: tough, taut, rough, amalgamated, firm
answer:
amalgamated


question:
Category: physical property 
Words: bulky, skinny, carbs, absorption, fat
answer:
carbs


question:
Category: emotional status 
Words: alert, calm, bright, fine, ok
answer:

bright