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: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive
answer:
refreshing


question:
Category: secretary duty 
Words: correspondence, schedule, answer calls, keys, file
answer:
keys


question:
Category: temperature 
Words: tropical, hot, unruffled, cold, cool
answer:

unruffled