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: October 15th is Global Handwashing Day. Activities are planned in more than twenty countries to get millions of people in the developing world to wash their hands with soap. Experts say people around the world wash their hands but very few use soap at so-called extremely moments. These include after using the toilet,after cleaning a baby and before touching food. Global Handwashing Day is the idea of the Public Private Partnership for handwashing with soap. The goal,they say,is to create a culture of handwashing with soap. The organizers say all soaps are equally effective at removing disease-causing germs  .They say the correct way to wash is to wet your hands with a small amount of water and cover them with soap. Rub it into all areas,including under the fingernails. Then,wash well under running water. Finally,dry your hands with a clean cloth. The Partnership says soap is important because it increases the time that people spend washing. Soap also helps to break up the dirt that holds most of the germs. And it usually  leaves a pleasant smell,which increases the chances that people will wash again. It also says that washing hands with soap before eating and after using the toilet could save more lives than any medicine. It could help reduce cases of diarrhea  ,which is the second leading cause of child deaths,killing more than one and a half million children a year,by almost half. 
 Answer: It gets all people into the habit of washing hands.
Solution:
Which fact can't explain why soap is important?