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.

Category: secretary duty 
Words: file, organize, schedule appointments, answer calls, program
program

Category: elements 
Words: ice, fire, burn, let go, combustion
let go

Category: chocolate food 
Words: wrongful, pudding, fudge, truffles, brownies

wrongful