You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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?
Why? In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input: Article: A long time ago, in an Italian city, the people there built a tower which was admired by everyone passing through. A little further down the road, in a neighboring city, they had built a tower of similar beauty. The two towers were equally well known. The people of the second city, envious   and filled with pride, planned to destroy the neighboring tower so it wouldn't take attention away from their own. One night, they came to the tower and began to quietly its foundations . The next morning, the tower was leaning  slightly ,but nobody noticed. The same happened for the following few days, until a little girl who was passing by pointed up at the tower and said: " I think the tower is going to fall down." And everyone around looked closely, and could see that she was right .Nervousness spread through the city. And they tried many methods to try to straighten the tower, but nothing seemed to work. That was, until one day when the same little girl was walking up again, and she put her arm on the side of the tower to rest. She felt the tower shaking slightly. When she took her hand off it, the movement stopped. And when she put it back on again, the same thing happened. The girl spent a while doing this, until she was completely certain of what she had discovered: " The tower is ticklish ( ) !" She ran to get some plants, and she planted them right next to the tower. Now if the tower leant over any further it would be tickled by the leaves of those plants. Being a ticklish tower, it would then return to where it had been. In this way, the girl managed to make sure that the tower didn't fall down, but still kept it leaning a little. The fact that it was leaning made it even more famous, and this taught a fine lesson to the envious people of the neighboring city. 
 Answer: Because they hoped that visitors just liked their own tower.
Solution:
Why did the people of the second city plan to destroy the neighboring tower?