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.

Example Input: Category: shady activities 
Words: banned, replace, smear, chocolate cake, fudge
Example Output: chocolate cake

Example Input: Category: emotional status 
Words: fine, wispy, alert, calm, relaxed
Example Output: wispy

Example Input: Category: emotional status 
Words: kind, unhappy, emotionalities, down, ground
Example Output:
ground