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: Helicopter Aerial Tour Explore the Grand Cannon from the eyes of the eagle. A wonderful 12- to 15-minute helicopter tour will soar through the canyon for an aerial experience of wonderful views. Our aerial tour is not available anywhere else in the world! Ticket:$120. 00 per person, plus 10% tax. Please call us at 1-888-868-9378 for seasonal rates, specials or to book by phone. Helicopter-Boat Tour Helicopter tour starts at the Grand Canyon, West Side. Take a 4,000-foot fall to the Colorado River below. Helicopters fall 4,000 feet from the canyon side to the banks of the Colorado River where visitors can enjoy a 15- to 20-minute boat ride down the Colorado. Ticket:$150. 00 per person, plus 10% tax. Champagne Helicopter Tour Experience the beauty of the Grand Cannon: Soar above the Hoover Dam and the dead volcanoes. You go aboard a million-dollar helicopter with all forward facing seats allowing 180 degrees of views in air-conditioned comfort. You will see the Hoover Dam, the Colorado River, the Grand Cannon and more! You land to have a champagne picnic lunch at the Grand Cannon. Las Vegas Adventure Tour Helicopter tours to the Grand Canyon West include a wonderful Las Vegas adventure tour. Aerial sightseeing tours originating in Las Vegas, Nevada include breathtaking views of Lake Mead, the Mohave Desert, and the west edge of the Grand Canyon. Aerial tours including the round trip as well as combination tours attract many visitors. Visitors arriving at the Hualapai elation's Grand Cannon West Airport may select one of the activities above.
Answer: 330 dollars.
Example Output: How much should a couple pay for a helicopter-boat tour?

Example Input: Article: A board game is a game played on a pre-marked surface or "board" according to a set of rules. Board games have been played in most cultures and societies throughout history. Do you think of yourself as a bit of an expert at board games like chess or Go? Maybe you're not quite as good as you think. New research from the University of Manchester and Oxford suggests complex games like these are impossible to learn fully. They may even be too complex for the human mind to understand. Researchers studied two-player games, to try and understand the strategies which people use to make decisions during the game. Some games with two players are simple, with only a small number of possible moves. Players can quickly work out the best strategy but that means the game soon becomes boring. It gets more interesting when there are many possible moves. That's why people are so fascinated by complex board games like chess or Go, or some card games. But what the researchers found was that with difficult games, players find it hard to work out the best strategy and their actions become less reasonable. This research is part of the field called game theory: the study of human strategic decision-making. Much thinking on how people play complex games is based on something called "the balance point", which is when players have a perfect knowledge of what they are going to do and of what their rivals are going to do. When you add more than two players then of course the game becomes even harder to understand. Trading on the stock market is an example of a complex multi-player game.
Answer: Mahjong
Example Output: Which of the following games belongs to board games?

Example Input: Article: World Book Day is a celebration of all things wonderful about books for all ages, with author events, school fancy-dress parades and a PS1 book token given to all school children under 18. It is a yearly event on 23rd April, organized by the United Nations Educational, Scientific and Cultural Organization ( UNESCO ) to promote reading. In the United Kingdom, the day is recognized on the first Thursday in March. On 3rd March 2016 children of all ages in the UK will come together to appreciate reading. Sometimes, reading a modern novel can be tough ( Booker Prize winner The Luminaries runs to 832 pages! ), especially if reading is not your strong suit. In fact, one in six people in the UK never pick up a book because they've experienced difficulties or are out of the habit of reading for pleasure. The Galaxy Quick Reads series are designed to introduce reluctant readers to bestselling short funny novels, which bring the joy of reading without demanding hours of concentrated time. They cover a range of subjects, from romance to comedy. Jojo Moyes's Paris For One is a romantic adventure in which 26-year-old Nell books a weekend away to Paris with her lazy, neglectful boyfriend. When he fails to turn up, she is alone in the city. That is, until she meets Fabien, who shows her the charms of the French capital -- in more ways than one. Adele Geras's moving story Out In The Dark was set in World War I, in which young Rob came back from the battlefields. Determined to find the officer's widow to return the photo of her and their daughter that the captain kept with him, he traveled several thousand miles but never gave up. Dead Man Talking is a fantastic tale of Pat, who had a terrible fight with his best friend, Joe, ten years ago -- but now hears that Joe is dead, and he must attend his funeral. But Joe is not going quietly that very night -- he's lying in his coffin being very chatty indeed.
Answer: To encourage reading.
Example Output:
What is the main aim of the World Book Day?