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: 6.5 million people die each year from diseases related to #AirPollution. That's the 🌎's largest single environmental risk to health #COP22 WHO (@WHO) November 13, 2016 Question: what's the worlds largest risk to health? Answer: air pollution

yes