You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: "MEN" AT WORK 
Clue: This journalist said no one "has ever lost money by underestimating the intelligence of the great masses"
mencken

Category: GIMME AN "F" 
Clue: It's a humorous term for comic strips, or the section in which you find them
funnies

Category: ADD AN ELEMENT SYMBOL 
Clue: Tack the symbol of this element onto "el" & you get a lodge member

potassium