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: When you walk down the street and see your ex 9GAG (@9GAG) February 2, 2015 Question: who posted this tweet with this picture? Answer: 9gag

Ex Output:
yes


Ex Input:
Context: Captain Patrick Sondenheimer, the man who tried to save #flight9525, a true hero, is the name I'll remember. #GermanWings #RIP— Verena King (@verenaking) March 28, 2015 Question: what is the name of the man who tried to save the german wings flight? Answer: patrick sondenheimer

Ex Output:
yes


Ex Input:
Context: Had to head out to Middlemarch to find clear sky tonight Here's a pic taken at 21:26 #Dunedin #aurora #astronomy Ian Griffin (@iangriffin) March 18, 2015 Question: what kind of phenomena can be described in this photo? Answer: an aurora

Ex Output:

yes