In this task, you are given a context tweet, a question and corresponding answer of given question. Your task is to classify given passage into two categories: (1) "yes" if the given context is useful in answering the question, and (2) "no" if the given context is not useful.

Ex Input:
Context: Met some of you #nolefam's yesterday. Autograph for a smile, hehe I think this exchange was in my favor. Novak Djokovic (@DjokerNole) August 14, 2014 Question: what does he think was in his favor? Answer: the exchange of autographs for a smile.

Ex Output:
yes

Ex Input:
Context: And #GLORY wins. Look at those smiling faces. Common and Legend are masters with words. What a powerful Oscar moment. #SelmaIsNOW Dine Alone Records (@dinealonemusic) February 23, 2015 Question: which music record won its oscar? Answer: glory

Ex Output:
yes

Ex Input:
Context: From the @CDCgov, #Ebola is not airborne. Requires close contact with symptomatic infected person. 2 cc @texasinafrica kim yi dionne (@dadakim) September 30, 2014 Question: where does the information about ebola come from? Answer: cdc gov

Ex Output:
yes