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.

Example input: 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.
Example output: How many books are there in the British Library?
Example 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.
Q: Article: On the way home from school, Jack always passes a park. His mother said it was dangerous to pass by the park at night, but it is the fastest way home. Today, after finishing soccer practice, Jack was walking toward the park as usual. Suddenly, Jack heard someone calling him, "Excuse me!" Jack turned around, and there was an old woman. "Yes, ma'am." Jack answered politely. "Don't pass by the park tonight." Her voice was weak and dry. "Okay, ma'am," said Jack carelessly. The old woman held Jack's hand strongly, and said, "I mean it!" Jack felt the hairs on his neck stand up. As soon as the lady let go of his hand, he started to run. This time, he ran so fast that he didn't have time to think where he was going. When he stopped, he realized he was in the middle of the park. He remembered what the old woman had said, but it was too late. He thought, "It would be okay if I run really fast." Suddenly, he heard someone scream . Jack was too frightened to wonder who it was. He breathed as deep as possible. The screaming continued. He heard some fast footsteps approaching, so he turned around. It was the old lady! She walked toward him, and shouted "I told you not to come here!" Frightened to death, Jack screamed sharply and ran home like an arrow. He thought he heard not only the old lady, but also some other people shouting at him, and it made him more terrified. As soon as Jack saw his mother, Jack said, "Mom! Do you know what just happened at the park?" Jack's mother nodded, and said, "Yes, I know. There is a movie shooting tonight in the park."
Answer: Mother told Jack a frightening story.
A:
What does the story mainly tell us?