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: emotional status 
Words: truss rod, emotional supports, emotional upsets, emotionalities, fret

Answer: truss rod


Question: Category: type of sandwich 
Words: submarine, burger, bar, lettuce, club

Answer: bar


Question: Category: shady activities 
Words: fix, mangle, fib, rich, fudge

Answer:
rich