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.
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Question: Context: Happy Birthday Nelson Mandela. You teach us tolerance, forgiveness and simple kindness. #Saint— Kim Engelbrecht (@kimengelbrecht) July 18, 2012 Question: whose's birthday is it? Answer: nelson mandela

Answer: yes


Question: Context: Rory had quite an adventure at No. 18 today. #QuickHits PGA TOUR (@PGATOUR) March 8, 2015 Question: what happened to the first shot in the tweet? Answer: the ball went into the water.

Answer: yes


Question: Context: VIDEO: Finals day at Henley Royal Regatta 2014, celebrating the 175th Anniversary with stunning racing. #HRR175— Henley Royal Regatta (@HenleyRegatta) July 6, 2014 Question: who was singing a whitney houston tribute? Answer: christina aguilera

Answer:
no