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: I met this sweet, generous & brilliant man Robin Williams in 1991. Here we are with HIS idol Jonathan Winters. #RIP Kathy Griffin (@kathygriffin) August 11, 2014 Question: who did kathy griffin meet in 1991? Answer: robin williams

yes