In this task, you're given an article, a question which often contains a blank, four options (associated with "A", "B", "C", "D") and the answer to that question. Your task is to classify whether the given answer is correct or not by providing "Yes" or "No", based on the article.

Article: While many other teen stars built up their celebrity status by working hard on popular TV shows, Justin shot straight to the top by using social media. A few years ago, Justin uploaded videos of himself on YouTube, showing _ of his favorite songs at home. He just saw it as a bit of fun for friends and family, but when music manager Scooter Braun saw one of the videos, he flew to Justin's hometown of Ontario, Canada to sign him up. Justin was just 13. Shortly after, Justin was flown to the US. He eventually started working with R&B superstar Usher. Justin's first album My world was released in 2009. But all the time, Justin continued to build his fan base on his YouTube account, where some of his original home videos can still be found, and where he continues to post music. "I wasn't sending mixtapes or anything like that to record labels," he told us when we met him on his promotional tour for his latest film Justin Bieber: Never Say Never. "I was just doing regular stuff at home and I just posted videos online without purpose. I would never be here if it wasn't for the Internet and YouTube." But it isn't just YouTube that helps Justin's popularity. He also updates his Twitter account (@Justin-Bieber) regularly and has about 8.8 million followers. In fact, he's so popular that Justin was responsible for 3% of the site's activity at one time and so popular that entire racks of servers on Twitter were devoted to him. In light of his story, many young, aspiring artists are now taking advantage of Twitter and YouTube. Both these sites can help artists build fan bases in the hope that they'll become the next big thing. Justin added, "I think my story brings hope to people and I think that's very important. The only thing holding you back is yourself. Never say never."
Question: What is the best title for the passage?
Options: (A) A famous young man (B) YouTube---A popular website (C) Justin's way to success (D) Social media is the most important
Asnwer: B
No

Article: Does it drive you crazy that your cell phone needs to be frequently charged for hours? A team of scientists led by professor Harold Kung at Northwestern University in the US may have solved your problem. They developed a lithium ion batery that holds 10 times as much power and charges 10 times more quickly than standard batteries, according to the BBC in a report on November 15. Lithium ion bateries are rechargeable and are widely used in cameras, smartphones and laptops. They charge through a chemical reaction in which lithium ions are sent between the two ends of a battery. How much power the battery holds and how fast it charges are limited by two things:how many lithium ions it has and how quickly these ions move. Current rechargeable batteries have an anode made of many carbon-based graphene sheets. To increase energy capacity, former experiments have tried to replace the carbon with silicon, which can hold far more lithium ions. However, this method did not work because the silicon was not stable enough. Kung's team managed to stabilize the silicon. They put clusters of silicon between the graphene sheets like a sandwich so that the silicon could not move around freely and take away the energy. The speed at which a battery charges is hindered by the shape of the graphene sheets because it takes a long time for the lithium to travel from one side of the sheet to the other.Sometimes a "traffic jam" occurs around the edges of the graphene. To solve this problem, Kung's team used a special chemical process to create tiny holes of 10 to 20 nanometers wide in the graphene sheets so the lithium ions would have a "shortcut" and be able to travel directly to the other side. This reduced the time it took the battery to recharge. About 15 minutes of charging can last more than a week. "Even after 150 charges, which would be one year or more of operation, the battery is still five times more effective than lithium ion batteries on the market today," said Kung. The technology could be widely available within five years, the researchers said.
Question: What is the major problem of current rechargeable batteries?
Options: (A) They are not very stable. (B) They cannot hold enough silicon. (C) They have limited energy capacity. (D) The space between the graphene sheets is too big.
Asnwer: A
No

Article: When Carlos Westez died at the age of 76, a language died, too. Westez, more commonly known as Red Thunder Cloud, was the last speaker of the Native American language, Catawba.www.ks5u.com Anyone who wants to hear various songs of the Catawba tribe can get in touch with the Smithsonian Institution in Washington, D.C., where, back in the 1940s, Red Thunder Cloud recorded a series of songs for future generations. They are all that is left of the Catawba language. The language that people used to speak is gone forever. We are all aware of the damage that modern industry can do to the world's ecology. However, few people are aware of the effect that widely spoken languages have on other languages and ways of life. English has spread all over the world. Chinese, Spanish, Russian, and Hindi have become powerful languages, as well. As these languages become more powerful, their use as tools of business and culture increases. When this happens, hundreds of languages that are spoken by only a few people die out. Scholars believe there are about 6,000 languages around the world, but more than half of them could die out within the next 100 years. Araki is a native language of the island of Vanuatu, located in the Pacific Ocean. It is spoken by only a few older adults, so like Catawba, Araki will soon disappear. Many languages of Ethiopia will have the same fate because each one has only a few speakers. In the Americas,100 languages also are dying out. Red Thunder Cloud was one of the first to recognize the threat of language death and to try to do something about it. He was not actually born into the Catawba tribe, and the language was not his mother tongue. However, he was a frequent visitor to the Catawba reservation in South Carolina, where he learned the language. The songs he sang for the Smithsonian Institution helped to make Native American music popular. Now he is gone, and the language is dead.
Question: Why did Westez record songs for the Smithsonian Institution?
Options: (A) To fight for Native Americans' rights. (B) To deal with the threat of language death. (C) To make Native American music popular. (D) To help young people learn Catawba songs.
Asnwer: D
No