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 Q]: Context: PM: "I'm delighted by the news that the Duke & Duchess of Cambridge are expecting a baby. They will make wonderful parents." #royalbaby— UK Prime Minister (@Number10gov) December 3, 2012 Question: is this clothing warmer or colder? Answer: warmer
[EX A]: no

[EX Q]: Context: We can't destroy the competitiveness of our factories in order to prepare for nonexistent global warming. China is thrilled with us!— Donald J. Trump (@realDonaldTrump) November 5, 2012 Question: who is thrilled with us? Answer: china
[EX A]: yes

[EX Q]: Context: MT @HaertlG: #Canada #Ebola suspect tests NEGATIVE for Ebola, Marburg, Lassa, CCHF, RVF at Winnipeg BSL4 lab— WHO (@WHO) March 25, 2014 Question: where were the tests done? Answer: winnipeg bsl4
[EX A]:
yes