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: P5+1 & #Iran reached agreement, bringing insight & accountability to nuclear program - not for small # of yrs, but lifetime of program.— John Kerry (@JohnKerry) July 14, 2015 Question: how long is the agreement for Answer: lifetime of program

yes