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.

[EX Q]: Context: HMS Lancaster, known as the 'Queen's Frigate', sent a message of congratulations to @KensingtonRoyal on the new birth Royal Navy (@RoyalNavy) May 2, 2015 Question: what is the hms lancaster known as? Answer: the queen's frigate
[EX A]: yes

[EX Q]: Context: Mirka and I are so incredibly happy to share that Leo and Lenny were born this evening! #TwinsAgain #Miracle— Roger Federer (@rogerfederer) May 6, 2014 Question: who is report the soldier is dead? Answer: official sources
[EX A]: no

[EX Q]: Context: Jason Spezza notches his 800th point on Tyler Seguin's second period goal. #GoStars# Dallas Stars (@DallasStars) March 12, 2016 Question: how do i give a free sub? Answer: buy any sub & 30oz drink
[EX A]:
no