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: The dirty, homeless man sat on the pavement, staring at the stones. He thought back more than twenty years to when he was a boy living in a small red brick house on this very street. He recalled the flower garden, the swing his dad made, and the bike he had saved up for months to buy. _ , for the brightness of those pictures hurt him, and his memory traveled on another ten years. He had a job by then, plenty of friends and started to come home less. He did not really want to remember those years, nor the day when, because of debts, he had gone home planning to ask for money. He felt embarrassed, but he knew exactly where his dad kept the money. When his parents stepped out of the room, he took what he wanted and left. That was the last time he had seen them. Ashamed, he went abroad, and his parents knew nothing about the years of wandering or time in prison. But locked in his cell he often thought of home. Once free, he would love to see his parents again, if they were still alive, and still wanted to see him. When his prison time was up, he found a job, but couldn't settle. Something was drawing him home. He did not want to arrive penniless, so he hitchhiked most of the long journey back. But less than a mile from his destination he started to feel sick with doubt. Could they ever accept this man who had so bitterly disappointed them? He spent most of that day sitting under a tree. That evening he posted a letter which, although short, had taken him hours to write. It ended with: I know it is unreasonable of me to suppose you want to see me ... so it's up to you. I'll come early Thursday morning. If you want me home, hang a white handkerchief in the window of my old bedroom. If it's there, I'll come in; if not, I'll wave good-bye and go. And now it was Thursday morning and he was sitting on the pavement at the end of the street. Finally he got up and walked slowly toward the old house. He drew a long breath and looked. His parents were taking no risks. _ The man threw his head back, gave a cry of relief and ran straight through the open front door.
Answer: He was longing to return home and felt excited.
Solution:
Why did it take him hours to write the letter?