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: Air traffic controllers in the US have been advised to take 26-minute naps , after a series of accidents involving workers falling asleep. Now the National Transportation Safety Board (NTSB) is calling for "controlled naps" during nightshifts . NTSB member Mark Rosekind said that a 26-minute nap would improve performance by 34%. He believes that beyond the aviation industry, other professions, such as motoring and machinery, also carry obvious risks. But other experts doubt whether 26 minutes is the appropriate napping time. It's a bit too long and risks you falling into a deep sleep, says Jim Horne, director of the Sleep Research Council. He said, "A nap of about 15 minutes is best; once you get beyond 20 minutes, you risk a deep sleep and you can be much more tired when you wake up. Therefore, we suggest that a nap be combined with a cup of coffee so that you can enjoy an effective sleep before the caffeine takes effect in 20 minutes. However, this method only works on those who have had a poor night's sleep. If you haven't had a sleep the night before, this method won't be enough to make you fresh." Health writer, Linda Wasmer Andrews, also believes that 26 minutes is too long. She says a nap between 10 and 20 minutes is enough, and the timing of the nap is also important. Putting your head down too early means your body may not be ready to sleep yet, but a nap that is too late in a day might make it harder to fall asleep. Early afternoon is often the best time, between l pm to 3pm, when people experience a post-lunch decrease in energy.
Answer: How long a nap should last.

Ex Output:
What does the text mainly talk about?

Ex Input:
Article: Some people are pessimistic when they think about the future. They say that, a hundred years from now, we will have used up most of the earths resources. We will have made our seas so dirty that we will not be able to eat fish from them. There will be so many people in the world that we will have to use all the countryside for housing; there will be no farmland left. Other people have a different idea about the future. In their view, the city of the future will be a huge pyramid-shaped building, which will be floating on the surface of the sea. About 5,000 families will live there, and there will also be schools, shops in it. In a hundred years' time, people will not need to use oil. They will heat their homes with power from the sun. Think of space. Perhaps a station will be set up on the moon; people will be able to visit the moon as tourists. They may even spend their holidays in space, travelling from planet to planet. What an interesting picture! Many people don't think about the future. "I don't care. I'll be dead. "they say. But it is our duty to care because the world of a hundred years' time will be the world of our children's and their children after them.
Answer: Three

Ex Output:
How many viewpoints are discussed here about the future?

Ex Input:
Article: A group of people from Denmark have formed the B-Society. According to them, human beings are divided into types: A-People, and B-People. A-People have no problem getting up in the morning, and operate much better earlier in the day. However, B-people are better later in the day. "I'm useless early in the morning," says one of the members of the B-Society."All I can do is drink coffee, and stare into space. People used to get up early because they had to feed the animals. But I haven't got any cows or chickens, so I can sleep late," She adds. Since the society was set up, the B-Society has welcomed several thousand members. Right now, the B-Society is fighting hard for businesses to join its B-certification list. Companies that are "B-certified" basically give their employees the opportunity to come in when they want. In some companies, employees arrive at any time up to 3:30 pm --- each to their own rhythm . And it is not just businesses that are benefiting from this. Teenagers who can't get out of bed in the morning, and parents who never quite get the kids to school on time, can now benefit from B-classes. From next year, a school in Copenhagen will offer classes which start later in the day (at 10 instead of eight). And even the government seems to like the idea. The B-Society was founded by Camilla Kring, a professor from the University of Copenhagen. On her website, she says, "When B-people's work rhythms are considered at the work place, their productivity and quality of life is increased, which can increase productivity for the entire organization." She adds that, "B-Society will create a new daily rhythm in schools and other institutions as an alternative to the current rhythm of 'early at work and early at home'. We are working for the establishment of kindergartens, primary and secondary schools as well as universities that open between 10 am and 8 pm." Would you like to work for a B-certified company?
Answer: Late risers.

Ex Output:
According to the text, who belong to the B-Society?