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: happy freedom day 2015 South Africa.. "for to be free is not merely to cast off one's chai... Merentia van der Ven (@Merentia) April 27, 2015 Question: what day is freedom day in south africa? Answer: april 27th
Output:
yes