Part 1. Definition
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.
Part 2. 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.
Answer: 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.
Part 3. Exercise
Article: In Europe, many people make friends between their countries through town twinning. Town or city twinning means two towns in different countries agree and decide to become "twins" with a sister-city relationship. The people find pen friends in the twin town. They exchange newspapers and stamps. The school teachers discuss teaching methods with the teachers in the twin town. Officials visit the twin town for celebrations. Ordinary people travel to the twin town, too, but not very often if it is far away. Sometimes, schools even exchange their classes for two or three weeks! For example, German middle school students study for a while at the school in their twin town in Britain, staying with British families. A few months later, their British friends come to study in Germany. Many British towns are so pleased with the results of the twinning that they set out to find more than one twin town! Tonbridge, a small town in Kent, for example, has twin towns in both Germany and France. Richmond near London has relationships with Germany, France and even a town in a Balkan  country! Town twinning can help make friends. It helps students improve their language skill, and also helps people to understand the differences between nations. 
 Answer: Town Twinning
Answer:
Which is the best title for the passage?