In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
One example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Solution is here: How many books are there in the British Library?
Explanation: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

Now, solve this: Article: Western teens share their top tunes Have you ever wondered what kind of music kids across the Pacific Ocean are listening to? Are they crazy about Britney Spears? Do they love the Backstreet Boys? Or do they dance to Eminem? Well, nearly 6,000 teens have taken part in a Teens & Music study, conducted by USA Weekend Magazine last autumn. And the results show what type of music is hot and what is not. It comes as no surprise that hip-hop and rap are the most popular types of music among American teenagers. They began in the mid-1970s, with young black kids in New York, taking music onto the streets. Hip-hop and rap are well-known for the breakdancing that goes with them. The word "rap" comes from a 1960s slang word for conversation. It is a rapid, slangy rhyme that is spoken rather than sung. Eminem is among the most popular rappers ever to hit the US. His first album "The Marshall Mathers LP" topped the American music chart in May 2000. Although about a third of teens in the US showed their support for him, almost as many said that his music was so offensive that they couldn't listen to it. Compared with Eminem, actor-rapper Will Smith is more of a star for the kids. He was awarded the Wannabe Award, on April 12 at Nickelodeon's 16th Annual Kids' Choice Awards. It is an award given to a celebrity whom kids most want to be. Pop music, such as Brittney Spears and the Backstreet Boys has always suited the tastes of the general public. It continues to enjoy support among teens and is second most popular after rap. Third is rock -- music with exciting dance beats and simple lyrics that speak loudly of social problems. The melodies are led by electric guitars. Rock became popular in the US in the early 1950s. American singer Elvis Presley and British group the Beatles became world-famous rock artists. The study also showed that jazz is least loved by American teens. It developed in the latter part of the 19th century from a mixture of African work songs and hymns . Jazz tends to be the type of music that people enjoy more as they get older.
Answer: Jazz.
Solution:
Which of the following developed the earliest, according to the text?