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: employment activity 
Words: promote, ice, retire, ban, fire
answer:
ice


question:
Category: construction 
Words: hoist, crane, excavator, egret, derrick
answer:
egret


question:
Category: animal 
Words: fly, jog, fish, jump, beetle
answer:

jog