instruction:
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.
question:
Category: alcoholic drinks 
Words: wine, rum, bridge, tonic, gin
answer:
bridge


question:
Category: emotional status 
Words: downward, unhappy, down, shameful, disgusted
answer:
downward


question:
Category: secretary duty 
Words: answer, correspondence, sort mail, file, motherboard
answer:

motherboard