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.
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Question: Category: shady activities 
Words: truffles, lie, falsehood, wrongful, fudge

Answer: truffles


Question: Category: animal 
Words: walk, flap, fish, fly, bats

Answer: flap


Question: Category: emotional status 
Words: ok, hearing, fine, content, mad

Answer:
hearing