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: When does it STOP South Africa? When do we STOP just "moving on"? Take control of our country for all our people.— Darren Keet (@popeyekeet) October 26, 2014 Question: what country does darren want to see change? Answer: south africa

yes