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: social gathering 
Words: picnic, french toast, clan, club, bar
french toast

Category: type of sandwich 
Words: meeting, bacon, submarine, toast, club
meeting

Category: social gathering 
Words: picnic, lettuce, team, club, cinema

lettuce