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.

Input: Consider 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.

Output: Why was Banff National Park built?

Input: Consider Input: Article: My 11-year-old son and I rides bikes to and from his school every day. I accompany him on the 20-minute ride through Manhattan, drop him off and return at the end of day to pick him up. We always ride together; sometimes he leads; sometimes I do. And as we ride, we communicate the ways to minimize the dangers: Don't go too fast, and watch out for doors suddenly swinging out from parked cars and jaywalking pedestrians, etc. Some friends worry about the risk of riding in traffic, but is there a better way to let my son know how to deal with traffic dangers? But recently he requested me to start hanging back a half block or so. This way he could enjoy the feeling of riding on his own, with the security of knowing that I was nearby in case he needed me. This is healthy, of course, as my son needs space to develop independence in preparation for his inevitable (,) departure from home. However, that means soon he will want to ride to school on his own, and I will no longer have this wonderful routine. "Let your children go if you want to keep them." I understand this and am trying to let my son go in age-appropriate phases, but I still suffer. It's one of the most troubling experiences of parenthood -- recognizing that your presence is becoming less welcome. My dilemma as a husband mirrors the concern I feel as a parent. My wife has just left on a six-month mission to cover the situation in Libya. In the days leading up to her departure, we spoke openly about the possibility, however unlikely, that she might be killed. But while I influence her decisions, I do not control them. Finally, it was her decision. I know that letting go is the wisest path in this case too. As we travel through life's phases, we must let go of so much. And I don't think it gets easier with practice. But maybe just accepting that eventually we will have to let go is the secret to living a full life.
Answer: To teach his son to ride in traffic.

Output: Why does the writer accompany his son on his daily ride to school?

Input: Consider Input: Article: For the past four years, the Green Festival in Washington, D.C., has brought together people from around the country who are interested in the environmental movement. The groups call the festival "a party with a purpose". They say the purpose of the Green Festival is to create an economy in which natural resources are used in a way that does not destroy the environment. To the people who organize the event, "green" means having a safe and healthy community and a strong local economy. Throughout the two-day event, over one thousand people volunteered to help the festival run smoothly. Four hundred businesses and organizations showed their products and projects. About three thousand visitors came to the party. They could find everything from naturally made organic food to clothing made from bamboo plants. There were over one hundred fifty speakers and discussion groups. For example, you could learn how to be an environmentally friendly traveler. You could also watch several movies about political and environmental issues. Then you could listen to some live music performances. After sitting for too long, visitors could take a yoga exercise class. There was even an area for children. Younger visitors could enjoy fun games and lessons on subjects like protecting the rainforest and creating chocolate sweets. Green building was one of the important subjects at the festival. Many companies and organizations aim to create environmentally safe buildings. They design structures with reduced energy use, fewer chemicals and more recycled materials. The Loading Dock is an organization based in Baltimore, Maryland. Its message is that "a person could build a house with what others throw away". The Loading Dock collects donations of used building materials such as flooring, lighting, doors, and windows. These materials would otherwise end up in a landfill trash center. Then, the group resells the materials. This way, the materials are recycled. This form of recycling provides entire families and neighborhoods with low cost solutions for rebuilding their communities. Spending a day at the Green Festival showed people many solutions for improving the health of our planet. People have _ green choices, from the things people buy to the ways people eat, think, and live. The Green Festival connects a wide community of people who care deeply about, and are working to improve, our shared environment.
Answer: To develop a green economy.
Output: What is the purpose of the Green Festival?