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: Here are some of the strangest buildings in the world. Please look at them and tell us your impressions. Stone House, Portugal The stone house in Portugal is really similar to the famous home of the Flintstones (<<>> ). It is built between two rocks and its architecture has impressed some of the greatest architects. The house was attacked by some bad people. The house is pretty comfortable inside, with a fireplace and every- thing necessary, so it is a wonderful example of modern architecture in Stone Age style! Dancing Building, Czech Republic The Dancing House, or "Fred and Ginger", is situated in Prague, the Czech Republic. It is an amazing masterpiece of architecture which has its own romantic charm. There is something so sweet in the way the buildings hug each other for a dance! It has become a symbol of the city! The Crooked House, Poland The crooked house in Poland has an extraordinary and amazing structure. It was built in 2003 with its design based on the pictures of Jan Marcin Szancer and Per Dahlberg. It looks as if it has been taken from a cartoon: its design is "crooked", but it is balanced, so it is not ugly at all, just strange! The interesting part is how builders managed to create this genius idea, but the house is a fact and everyone admires their creativity! Habitat 67, Montreal, Canada Habitat 67 in Canada is a very interesting arrangement of cubes,which looks like the building blocks that children play with. It is pretty interesting how it was designed -- it looks so original, and at the same time the building is completely stable and comfortable for living! It was created as a main attraction for Expo 67, where it was officially exposed!
Answer: They are both examples of great architecture.
Output:
What is a common feature of the Stone Houseand the Dancing Building?