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: banned, replace, smear, chocolate cake, fudge

Answer: chocolate cake


Question: Category: nutritional value 
Words: heavy, fat, protein, obese, carbs

Answer: obese


Question: Category: geographical property 
Words: horizontal, hotel, flat, lined, smooth

Answer:
hotel