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: On scene of river cruise disaster in #china. Weather is hampering search and hundreds still missing David McKenzie (@McKenzieCNN) June 2, 2015 Question: what country was the river distaster? Answer: china

yes