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: #8501QS if primary radar was tracking plane then why do we not know where missing aircraft went below radar altitude?— Thomas Dehel (@TDEHEL) December 28, 2014 Question: who won't ever use 280 characters? Answer: christine teigen

no