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 input: 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.
Example output: How many books are there in the British Library?
Example 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.
Q: Article: Experts have put forward detailed plans for a tunnel to connect Taiwan with the Chinese mainland. The shortest proposed route would be 126 kilometers more than twice the length of the English Channel Tunnel. And the longest proposed route would be 207 kilometers. A recent conference in Xiamen, Fujian Province brought together more than 70 experts. The event was co-sponsored by universities from Taiwan and the Chinese mainland. Fujian is the province where both proposed routes would begin. There is direct passenger access between the mainland and Taiwan by air and sea at the moment. Experts say that it is better to start research sooner rather than later, although there is a lack of government funding . There are no technical problems to build a Taiwan tunnel. But it will require an improved political relationship across the Straits . A professor of Tsinghua University said, "A special feature of huge projects is that the period of preparation is longer than the period of construction." For example, he said, the English Channel Tunnel took 14 years of planning and had been discussed for two centuries. And preparations for the huge Three Gorges Dam on the Yangtze River began in the 1950s. The Xiamen conference focused on the longest southern route, which would pass Jinmen and Penghu. The first stage of the new project could be a bridge to cross the five kilometers between Xiamen and Jinmen. This would mean that travelling from Xiamen to Jinmen by car would only take five minutes. The longest tunnel now being planned anywhere in the world is the 54-kilometer land tunnel to link Lyon in France with Turin in Italy. The tunnel will not be completed until 2015-2020.
Answer: The passage doesn't mention it.
A:
Which is the longest tunnel in the world at present?