Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: How many albums had Usher released by the year Everett started performing with Tina Turner? Passage:In 2008, Everett started by performing with one of her idols, Tina Turner, at the 2008 50th Annual Grammy Awards with Beyoncé. She featured in the video for "Love in This Club" by Usher and began a working relationship with him. In October of the same year, the video for "Single Ladies (Put a Ring on It)" was released, which featured a J-Setting choreography and contained only Beyoncé, Everett and dancer Ebony Williams. It has since gone viral, amassing over 580 million views and has been recreated thousands of times. It also won the MTV Video Music Award for Video of the Year. Everett featured in videos for both "Ego" and "Sweet Dreams" from I Am... Sasha Fierce (2008), and begun her second worldwide tour with Beyoncé, on the I Am... World Tour (2009–10). Here, Everett performed as the female Dance Captain for the entire tour. In 2010, Everett begun a working relationship with Ne-Yo and featured in three of his music videos from his album Libra Scale (2010); "One in a Million", "Champagne Life" and "Beautiful Monster". In 2011, Everett featured in three videos from Beyoncé's 4 (2011).


b