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.

Context: #Mpeketoni attack has been attributed to Al Shabaab. Military surveillance planes are currently airborne to help police operations. Disaster Operations (@NDOCKenya) June 15, 2014 Question: what is being done to help police operations/ Answer: military surveillance planes
yes

Context: "Without courage, we cannot practice any other virtue with consistency." -The courageous & inimitable Dr Maya Angelou John Conyers (@repjohnconyers) May 28, 2014 Question: what can we not practice without courage? Answer: any other virtue with consistency.
yes

Context: Dalton Hwy, MP 375-412, impassable, closing tonight at midnight. This will last 4 days, or until conditions change. Alaska DOT&PF (@AlaskaDOTPF) May 18, 2015 Question: how long will dalton highway be closed Answer: 4 days, or until conditions change
yes