Given the task definition, example input & output, solve the new input case.
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.
Output: How many books are there in the British Library?
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 case for you: Article: Amusement parks make most of their money from admission fees paid by guests attending the park. Other sources include parking fees, food and drink sales and souvenirs. Practically all amusement parks operate using one of two admission principles: Pay-as-you-go In this form, a guest enters the park at little or no charge. The guest must then buy rides one by one, either at the attraction's entrance or by buying ride tickets. The cost of the attraction is often based on its complexity or popularity. The park may allow guests to buy unlimited admissions to all attractions within the park. A pass is then shown at the attraction entrance to gain admission. Disneyland opened in 1955 using the pay-as-you-go form. Initially, guests paid the ride admission fees at the attractions. Soon, the problems of dealing with so many coins led to the development of a ticket system that, while now out of use, is still part of the amusement-park vocabulary. In this new form, guests bought ticket books that contained a number of tickets, with "A," "B" and "C." Rides and attractions using an "A-ticket" were generally simple, with "B-tickets" and "C-tickets" used for the larger, more popular rides. Later, the "D-ticket" was added, then finally the now-famous "E-ticket," which was used for the biggest rides, like Space Mountain. Smaller tickets could be traded up for use on larger rides. Disneyland, as well as the Magic Kingdom at Walt Disney World, gave up this practice in 1982. The advantages include: guests pay for only what they choose to experience attraction costs can be changed easily The disadvantages include: guests may get tired of spending money almost continuously guests may not spend as much on food or souvenirs
Answer: Sources of income of amusement parks.
Output:
What is the passage mainly about?