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: Wood Buffalo National Park Wood Buffalo National Park is Canada's largest national park and one of the largest in the world. Established in 1922 to protect the last remaining herds of bison in northern Canada, it now protects an outstanding example of Canada's Northern Boreal Plains. The park was designated a World Heritage Site in 1983. Phone: (780) 697-3662 E-mail: wbnp.info@pc.gc.ca Banff National Park of Canada Banff's rich history dates back to 1885, when three railway workers stumbled upon hot mineral springs surfacing from deep within the mountains. This discovery led to the establishment of Banff National Park, and marked the beginning of Canada's national park system. Spanning 6,641 meadows and rivers, Banff National Park is one of the world's premier destination spots. Phone: (403)762-1550 E-mail: banff.vrc@pc.gc.ca St. Lawrence Islands National Park of Canada Conceived in the 1870s, St. Lawrence Islands is one of Canada's oldest national parks. Located in the scenic 1,000 Islands tourist area, this tiny jewel has a rich and complex natural human history. Centuries ago, aboriginal peoples referred to it as the "Garden of the Great Spirit". Today, 24 scenic islands, along with a mainland area at Mallory town Landing, are included in the park. Phone: (613) 923-5261 E-mail: ont. sli@pc.gc.ca Grasslands National Park of Canada It was here Sitting Bull took refuge after the Battle of Little Big Horn in 1876. Grasslands National Park is the first national park of Canada to preserve a portion of the mixed prairie grasslands. This magical land of diversity, beauty and history is divided into two blocks. The East Block contains the Killdeer Badlands and the Wood Mountain Uplands, and the West Block preserves the Frenchman River Valley and the dissected plateaus, coulees and famous 70 Mile Butte. Phone: (306) 298-2257 E-mail: grasslands. info@pc.gc.ca
Answer: Because hot mineral springs were found in Banff.
Example Output: Why was Banff National Park built?

Example Input: Article: What's the most expensive place to station an employee overseas? London? Tokyo? Sao Paulo? Try Luanda, Angola. That's the finding of a survey by Mercer, the world's largest human resources consulting firm, headquartered in New York City. Two African cities (Luanda, N'Djamena) were in the top 10, along with four (Moscow, Geneva, Zurich, Bern) in Europe, three (Tokyo, Singapore, Hong Kong) in Asia and one (Sydney) in Australia. Switzerland alone has three cities in the top 10. Mercer's 2013 Cost of Living Survey examined data from 214 cities worldwide, comparing a market basket of over 200 goods and services, including unfurnished luxury two-bedroom apartments or three-bedroom houses, movie tickets, blue jeans, international newspapers, coffee, fast food restaurant meals, gasoline, milk and soda. If it sounds odd that Angola would be the most expensive, Mercer's Barb Marder explains that"Despite being one of Africa's major oil producers, Angola is a ly poor country yet expensive for expatriates since imported goods can be dear. In addition, finding secure living accommodations that meet the standards of expatriates can be challenging and quite costly."The survey found similar supply issues in N'Djamena, Chad, the other top 10 city in Africa. Mercer measured locations worldwide against New York, on a U.S. dollar basis, meaning that exchange rate shifts could impact the rankings. For example, although Tokyo is Asia's most expensive city for people who live in a foreign country, the weakening of the Japanese yen against the dollar makes it seem cheaper than it was a year ago. Canada, too, has become a bargain as the U.S. dollar strengthens against the Canadian dollar. Measurements were taken in March, 2013. What's the trend in the United States?"Overall, U.S. cities either remain stable in the ranking or have slightly decreased due to the movement of the U.S. dollar against the majority of currencies worldwide,"explains Mercer's Steven Nurney. However, that may change as real estate prices rise nationwide. New York is the nation's most expensive place to station expatriates. While housing is generally the most important factor in the survey rankings, the survey revealed some other significant differences in prices. For example, you may need a vodka chaser after paying $ 8.29 for a cup of coffee in Moscow, but the same coffee in Managua, Nicaragua would cost only $ 1.54. Expect to pay $ 20.10 for a movie ticket in London, versus $ 5.91 in Johannesburg.
Answer: New York.
Example Output: Which of the following cities may be the cheapest for employees overseas?

Example Input: Article: Many thousands of Chinese are studying at schools in the United States. And writer Liel Leibovitz says the students are following an example that began in the eighteen seventies. Mr. Leibovitz and writer Matthew Miller joined forces to tell the story of the students in their book, "Fortunate Sons." The book says China sent one hundred twenty boys from 1872 to 1875 to America to learn about developments that could help modernize their country. Mr. Leibovitz got the idea for the book about the boys a few years ago when he was traveling with his wife in China. Mr. Leibovitz learned that Qing government sent a whole delegation of boys to learn the ways of the West. The goal was for them to return to China and help their country. The book says the boys received their American training in Massachusetts, New York, New Jersey and Connecticut. It must have been a very good education. Mr. Leibovitz says the first prime minister of the Chinese Republic completed this program. And so did the first engineer to build a large-scale railroad without foreign help. The same was true of the fathers of Chinese education, diplomacy and the Navy. The book-writers had only to open some boxes containing the writings of these men to learn about them. Their notebooks, journals, letters and postcards were in English. Mr. Leibovitz said he was lucky to have so much information from events that took place long ago. The students returned to China after about nine years. They no longer spoke Mandarin well enough to answer questions. Police welcomed them home by putting them in jail. The young men were released after about a week. But they were given low-level jobs. Mr Leibovitz says it took about ten years for them to rise to higher positions. He said their story continues today with large numbers of Chinese studying in the United States.
Answer: 210.
Example Output:
How many exchange children did Qing government send to America?