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.

Let me give you an 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.
The answer to this example can be: How many books are there in the British Library?
Here is 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.

OK. solve this:
Article: Two magazines recently listed the best cities to live in. Here are two of the cities listed as "the world's best." SAN JOSE, COSTA RICA The city has comfortable weather all year round (15degC to 26degC ). Housing is not very expensive in San Jose. Also, many of the city's older neighborhoods are very beautiful and have small hotels and cafes . Beautiful mountains are around the city. You can visit them easily from San Jose. So lots of people go sightseeing there every year. But air pollution is a problem in the city center. HONG KONG, CHINA This lively city--once a small fishing village--is today an international business center. It is an interesting mixof East and West, old and new. Modern tall buildings are next to small temples . Popular nightclubs are close to traditional teahouses. Busy people fill the streets at all hours of the day. But outside the city, there are parks for walking or relaxing. Hong Kong is famous for its wonderful native dishes. There's also food from Europe, North America, and other parts of Asia. However, this small city has a large population. Nearly 7 million people live in Hong Kong! That's why housing is often very expensive. Traffic and air pollution are also a problem.
Answer: The traffic.
Answer:
Which of the following is not mentioned about San Jose?