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: merchandise, angry, ecstatic, content, joyful

Answer: merchandise


Question: Category: chocolate food 
Words: cake, fudge, rich, invent, cream

Answer: invent


Question: Category: aesthetic characteristic 
Words: high quality, mad, dull, attractive, fine

Answer:
mad