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.
One 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.
Solution is here: 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.

Now, solve this: Article: Lombard Street (San Francisco, USA) Known as "the world's most-crooked street," Lombard Street was first built in 1922 to reduce the hill's natural 27 % grade ,which was too steep for most vehicles. Lombard Street owns the record as the street with the most switchbacks in a single block. With eight steep and sharp turns, Lombard Street looks like a giant dizzy snake lying on the road. This famous street in San Francisco is known as the most-challenging street of all. Parliament Street (Exeter, England) This street in England is over a hundred years old today, but what makes it as an urban wonder is not its age but its unbelievable narrow size. Usually, a street is where a vehicle can conveniently pass, but that will never happen in the Parliament Street, as the street measures just 25 inches wide which is just enough for a ly medium-built person to pass. King Fahd's Fountain (Jeddah, Saudi Arabia) The fountain was donated to the city by King Fahd. Being the world's tallest fountain, it deserves to be an urban wonder. It was constructed between 1980 and 1983. This fountain shoots water in an incredible 1023-foot (312m) height which is greater than the height of the Eifel Tower. Because of its seemingly unreachable height, the waters of the King Fahd's Fountain can be sighted even if the visitors are miles apart. Damanhur Temple (Northern Alps of Italy) The underground of the modest homes of Italy's northern Alps is where a massive, richly -decorated temple is found. The Damanhur Temple was secretly constructed in the 1970s. Decorated with impressive murals and vividly-color1ed stain glass, the temple was once seized by the Italian government due to illegalities. After some time, it was returned to Oberto Airaudi, the builder and founder of Damanhur.
Answer: To ease the traffic.
Solution:
Why was Lombard Street built that way?