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: physical property 
Words: large, fat, capacitance, calories, ugly
Example Output: calories

Example Input: Category: animal 
Words: waggle, drive, fly, bee, dive
Example Output: drive

Example Input: Category: consumer product 
Words: content, jewelry, happy, file, clothing
Example Output:
happy