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: construction 
Words: hoist, tackle, digger, excavator, crane
answer:
tackle


question:
Category: consumer product 
Words: joyful, program, activity, food, content
answer:
joyful


question:
Category: physical activity 
Words: duck, crouch, sheep, stoop, dodge
answer:

sheep