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: 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 solution: 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.

Problem: Article: She is a cute , quiet girl. As a daughter, she has no secrets from her mother, who is very pleased with her. But recently she has become somewhat mysterious, not so open as before: what if she falls in love, which is too early for a girl of her age. After all, she is reaching the "dangerous stage". These thoughts have caused trouble in the mother' mind. One weekend the girl came to tell her mother that she was going to the cinema with her schoolmates and would return late. This was the first time her mother had agreed , and she couldn't help worrying because her daughter had never been away at night before. The mother waited till nine and her uneasiness got the upper hand over her. She decided to go out to meet her daughter. Just at that moment the noise of a car pulling up drew her to the window and ------there was her daughter, waving goodbye to a boy. Her heart missed a beat. When the girl came in, the mother was watching TV, pretending nothing had happened. "Mum, I'm back." "Yeah." "Sorry to be late. Still sitting up?" "Yes, Oh, that... Who's that boy?" The daughter was stunned for a moment. "Ah. It's my monitor. He gave a lift on his way home. Mum, I'm going to bed" "All right. Go to sleep early." Next morning, when the mother went to the daughter's room to do some tidying, she found her diary left at her pillow. After a few minutes' hesitation she finally opened it to the entry of the night before. It read: Mum, it was love that made you ask, but it would show your understanding of me if you hadn't. Holding the diary, the mother fell in thought.
Answer: What the girl did recently worried her mother.
Solution: Which of the following is TRUE according to the story?