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: One Tuesday, we got up, had breakfast and got ready for school. We picked up our school bags and went to school. I opened my school bag to get my homework after I went into the classroom and sat down. My school homework needed to be handed in. But it was not there! I remembered I had put it in my school bag. I thought back to Monday afternoon. I finished my school homework, put it in my school bag, and went out to play softball with the neighbor kids. My sister Sara was not out playing as usual. She read a book inside the house. She must have taken my homework while I was playing softball outside as no kids came inside our house on Monday. After school I ran to the place where my sister and I usually meet. There was Sara. She didn't seem to be laughing at me. She is good at giving false information. "Sara, what have you done with my homework?" I asked. She said she hadn't seen it! "What should I do?" I thought. I waited for a chance to talk to Mom. In Mom ' s room, I cried and shouted: I couldn't help shaking. I told her about my missing school homework. Hearing this, Mom left the room, went into the kitchen hurriedly and started looking in the trash. She pulled my school homework out of the trash! Mom said, "I' m sorry, Teri. I saw that your school bag was too heavy, so I cleaned it out for you. Your homework didn't look any different from the waste paper which I threw away." I realized that I had misunderstood my sister. I apologized to her. And I learnt a good lesson from this experience.
Answer: Because her sister was in the house while she was out.
Solution:
Why did the writer think it was her sister who had taken her homework?