Detailed Instructions: 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.
See one example below:
Problem: 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?
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.

Problem: Article: As long as I can remember, I've always loved to draw. But my interest in drawing wasn't encouraged very much. Growing up in the 1950s, in Grand Rapids, Michigan, boys were supposed to be athletic. Certain peer pressures encouraged little fingers to learn how to hold footballs rather than crayons. My early love for drawing developed into a love for telling stories through pictures. Stories began as fragments of pictures in my mind. I created a story by posing questions to myself. I called it the "what if" and "what then" approach. For example, for my book The Polar Express, I started out by thinking "What if a boy gets on that train? Where does he go?" From the time I come up with the idea, write and illustrate the book, and deliver it to the printer, it takes about seven months. First, I begin thinking of the idea. Then I imagine the pictures and the story. A good picture book should have events that are visually _ . I first consider scenes that are exciting to look at and then my challenge is to weave a story around those pictures. The next step is putting the illustrations and story down on paper. When you first look at my illustrations, you see ordinary, everyday things. But if you look closer, things might not seem quite so simple. When I'm writing a book, I always try to create something strange or puzzling in each picture. By using artistic strategies, I can give the drawing a kind of mysterious quality. All of my books are picture books, so they are generally thought of as books for children. But when I make them, I think of the books as being for everybody -- for people of all ages. When I was a kid, I had no idea what I wanted to be when I grew up, but now I'm really glad I became an artist and a storyteller.
Answer: To show us how he designed his book.
Solution:
Why does the author mention The Polar Express?