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: Obama reacts as he is greeted by a man wearing a horse-head as he walked the streets of downtown Denver. Doug Mills (@dougmillsnyt) July 9, 2014 Question: what is obama reacting to? Answer: a man wearing a horse head

yes