Definition: 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.
Input: Context: Can you believe that the corrupt and pathetic South Africa police force has yet to arrest the sign language guy. Such danger-give 10 years!— Donald J. Trump (@realDonaldTrump) December 13, 2013 Question: what is burnet institute staff safe from? Answer: tavurvur

no