In this task, you are given a context tweet, a question and corresponding answer of given question. Your task is to classify this question-answer pair into two categories: (1) "yes" if the given answer is right for question, and (2) "no" if the given answer is wrong for question.

Example Input: Context: BEYONCE IS PREGNANT AGAIN AND HAVING TWINS BLUE IS GONNA BE A BIG SISTER Jawn Valjawn (@jackiepayton) February 1, 2017 Question: how many younger siblings will blue have? Answer: two
Example Output: yes

Example Input: Context: At 1:21 before launch, a thrust vector control actuator for the Falcon 9's 2nd stage failed to perform as expected. @SpaceX is evaluating. NASA (@NASA) January 6, 2015 Question: what happened to the thrust vector control Answer: it failed
Example Output: yes

Example Input: Context: #CHILE fans break through security checkpoint & storm into stadium via pressroom #Chile VS #Spain #worldcup2014 Gustavo (@gustavocnn) June 18, 2014 Question: who are the competing countries in this tweet's worldcup? Answer: spain and chile.
Example Output:
yes