Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following 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: How many books are there in the British Library?
Reason: 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 instance: Article: She is only 12 years old but lives only with her younger sister. Her parents are far away from home, and she has to take care of her younger sister. She is He Can, a student at Anqing Jianzhen Middle School in Anhui, one of the "stay-at home children" in her town. To make money, these kids' parents go to big cities to find a job. Their children have to stay at home because they have to go to school. He Can's parents left home when she was only four. They only come back for the Spring Festival every year. Because she had to live with different relatives at different times, He Can went to eight different primary schools. "I used to complain," she said. "But later I understood my parents. They have to go away to make a better life for us." He Can said her frequently changing life also has a good side. "When I went to a new school, I had to try to make friends," said He Can, "I became outgoing. Now I'm not afraid of talking to people." He Can said her relatives were kind to her. They taught her how to cook and wash clothes. When she would start junior high school , her parents agreed to rent a house to let her live out with her sister. Every day, He Can gets up at 6:00 am and cooks breakfast. Then He Can does chores and helps her sister take a shower. She usually goes to bed at 9:30 pm. Though busy, He Can is still a top student in her class. She said the secret is never to put things off until tomorrow. " I think my life is OK," she said. "But if possible, I would like my parents to settle down and live with us."
Answer: Because their parents have to work in a big city.
Student:
Why does He Can live only with her younger sister?