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.

Ex Input:
Article: Metro Pocket Guide Metrorail Each passenger needs a farecard to enter and go out. Up to two children under ago five may travel free with a paying customer. Farecard machine are in every station, Bring small bills because there are no change machines in the station and farecard machine only provide up to $ 5 in change. Get one of unlimited Metrorail rides with a One Day Pass. Buy it from a farecard machine in Metro stations. Use it after 9:30 a. m. until closing on weekdays, and all day on weekends and holidays. Hours of Service Open: 5 a. m Mon-Fri 7a. m. Sat--Sun . Close: midnight Sun--Thurs 3 a.m. Fri.---Sat. nights. Last train times vary. To avoid missing the last train, please check the last train times posted in the station. Metrobus When paying with exact change, the fare is $ 1. 35 . when paying with a smarTrip card, the fare is $1. 25 Fares for the Senior /disabled customers Senior citizens 65 and older and disabled customers may ride for half the regular fare. On Metrorail and Metrobus, use a senior/disabled farecard or SmarTrip card. For more information about buying senior/disabled farecards, farecard or SmarTrip cards and passes, please visit MetroOpenDoors. com or call 202-637-7000 and 202-637-8000. Senior citizens and disabled customers can get free guide on how to use proper Metrobus and Metrorail services by calling 202-962-1100 Travel tips . Avoid riding during weekday rush periods -before 9:30 a. m. and between 4 and 6 p. m. . If you lose something on a bus or train or in a station, please call Lost & Found at 202-962-1195.
Answer: They make change for no more than $5.

Ex Output:
What should you know about farecard machine?

Ex Input:
Article: For millions of people, the American dream of owning a home seems to be slipping out of reach. "Maybe young couples can no longer afford to buy a ready-made house as their parents did,'' says 40-year-old building instructor Pat Hennin. "But they can still have a home. Like their pioneer ancestors, they can build it themselves, and at less than half the cost of a ready-made house." The owner-builders came from every occupational group, although surprisingly few are professional building workers. Many _ with little or no experience. "I learned how to build my house from reading books," says John Brown, who built a six-room home for $25, 000 in High Falls, New Jersey. "If you have patience and the carpentry skill to make a bookcase, you can build a house." An astonishing 50 percent of these owner-builders hammer every nail, lay every pipe, and wire every switch with their own hands. The rest contract for some parts of the task. But even those who just act as contractors and finish the insides of their homes can save from 30 percent to 45 percent of what a ready-made home would cost. One survey revealed that 60 percent of owner-builders also design their homes. Many others buy commercial house plans for less than $100 or use plans available from the U. S. Department of Agriculture.
Answer: The American dream of owning a house.

Ex Output:
What does the passage mainly tell us?

Ex Input:
Article: The globe is facing a "tidal wave" of cancer, and restrictions on alcohol and sugar need to be considered, say World Health Organization scientists. It predicts the number of cancer cases will reach 24 million a year by 2035, but half could be prevented. The WHO said there was now a "real need" to focus on cancer prevention by cutting down smoking, obesity and drinking. The World Cancer Research Fund (WCRF) said there was an "alarming" level of ignorance about diet's role in cancer. Fourteen million people a year are diagnosed with cancer, but that is predicted to increase to 19 million by 2025, 22 million by 2030 and 24 million by 2035. The developing world will bear the worst of the extra cases. Dr Chris Wild, the director of the WHO's International Agency for Research on Cancer, told the BBC: "The global cancer burden is increasing quite markedly, due predominately to the ageing of the populations and population growth. If we look at the cost of treatment of cancers, it is spiralling out of control, even for the high-income countries. Prevention is ly critical and it's been somewhat neglected." The WHO's World Cancer Report 2014 said the major sources of preventable cancer included: smoking; infections; alcohol; obesity and inactivity; radiation, both from the sun and medical scans; Air pollution and other environmental factors; delayed parenthood, having fewer children and not breastfeeding. For most countries, breast cancer is the most common cancer in women. However, cervical cancer dominates in large parts of Africa. One of the report's editors, Dr Bernard Stewart from the University of New South Wales in Australia, said prevention had a "crucial role in fighting the tidal wave of cancer which we see coming across the world". He said human behaviour was behind many cancers such as the sunbathe "until you're cooked evenly on both sides" approach in his native Australia. There was a similar argument to be had with sugar fuelling obesity, which in turn affected cancer risk. Meanwhile, a survey of 2,046 people in the UK by the WCRF suggested 49% do not know that diet increases the risk of developing cancer. A third of people said cancer was mainly due to family history, but the charity said no more than 10% of cancers were down to inherited genes. Amanda McLean, general manager for the WCRF, said: "It's very alarming to see that such a large number of people don't know that there's a lot they can do to significantly reduce their risk of getting cancer. In the UK, about a third of the most common cancers could be prevented through being a healthy weight, eating a healthy diet and being regularly physically active." "People can cut their risk of cancer by making healthy lifestyle choices, but it's important to remember that the government and society are also responsible for creating an environment that supports healthy lifestyles."
Answer: The problems of population ageing and growth.

Ex Output:
What's the main reason for the increasing of cancer according to Dr Chris Wild?