TASK DEFINITION: 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.
PROBLEM: Article: As a little boy I read a book with a picture showing a man reading while floating in the Dead Sea. What a miracle! How would it feel to lie back in water so thick with salt that it was impossible to sink? Fed by the Jordan River and smaller streams, the Dead Sea is the lowest point on the earth's surface, and its water is ten times saltier than the Mediterranean. As evaporation is its only outlet, salt and other minerals become super-concentrated. Earlier this year, I drove down the long, steep hill to realize my dream. The shoreline was a broad area of bare salt-mud, but the water edge was out of sight. It seemed as if somebody had pulled the Dead Sea's plug . Eli Dior, an Israeli official, explained the problem "The Dead Sea is drying up. Every year, the surface falls about one meter, and as the water level falls, shallow areas are left high and dry." Over the last half-century, the five neighboring countries have used up almost all the water flowing into the Dead Sea to meet human and agriculture needs. Result the Dead Sea is being emptied. With population in the neighbouring countries to double at least in the next 50 years, there is little hope of restoring the water being used in this area. No country has a drop to spare for the Dead Sea, where they know it will just evaporate. To dream of opening the dams and restoring natural balance is unrealistic. Yet one ambitious high-tech dream may turn out to be not only the solution to the Dead Sea but also a ticket to peace around its shores. The "Red-Dead" is a proposed $5 billion project to bring sea water some 240 kilometers by pipeline and canal from the Red Sea to the Dead Sea. The Red-Dead may be the only solution, but even if the project is carried out successfully, the Dead Sea will be 10 to 20 meters lower than now and two thirds of its current size. Whatever the future holds, the Dead Sea's magical mix of sun, mud, sea and salt will surely survive. Many might complain that the Dead Sea is half empty--but for me the Dead sea will always be half full.
Answer: Why the Dead Sea is so salty.

SOLUTION: What's the passage mainly about ?

PROBLEM: Article: When policy experts debate climate change solutions, they often talk about "a price on carbon." They are arguing about whether companies should pay when they put carbon pollution in the air. Proponents say that it's simple economics -- if it's free to pollute, you'll get a lot of pollution. Opponents claim it will raise the cost of energy that's produced from high carbon sources, like coal. But here's the secret that most people seem to be missing: There already is a price on carbon, and it's paid by the taxpayers. Carbon pollution, like every other form of pollution, has an impact on the environment. Throwing waste into a river will cause the fish to die and the people who drink the water to get sick. And when you produce carbon pollution, you get climate change -- sea level rise, stronger storms, severe droughts, damage to agriculture, and more. All of those impacts cost money. Insurance rates go up when storms get more destructive. Taxes increase when cities have to rebuild bridges and roads. Military budgets go up when droughts and population changes cause conflicts. Not to mention impacts on agriculture and health care costs. In other words, the price on carbon is what we all pay when there is no market force to limit the pollution that causes climate change. So the debate is really about who will pay that price -- the companies who are making a profit from the fossil fuels, or the taxpayers who pick up the cost now? Right now, we have private profit and public cost. It's just like if we allowed every business to throw its garbage in the street because it's too expensive to have it moved away properly. Does it add a little bit to your dinner check to require that restaurants dispose of their trash properly? Sure. But it would be more expensive for you if the city had to clean the streets of their garbage every day. So just like we put a "price on garbage" we need a "price on carbon pollution." Now, a "price on carbon pollution" can mean a lot of things. You could tax companies based on the amount of carbon pollution they produce, and return the money to taxpayers. You could put a limit on how much they can produce, thereby requiring them to invest in ways to conduct business in a less polluting way.
Answer: Whether the companies should pay for it.

SOLUTION: What do the policy experts argue about carbon pollution?

PROBLEM: Article: Most people looking for ways to quit smoking worry about weight gain, and with good reason. Smokers who quit tend to pack on an average of 5 pounds after they stop smoking cigarettes. A new study, published by the journal Science, explains why this happens. The new research explains that nicotine appears to combine with appetite-regulating neurons in the brain, besides the receptors that bring about addiction. These neurons help regulate how much food gets consumed, but under the influence of nicotine, they lose their self-control. This is why when smokers quit, they tend to eat more and gain weight. The researchers believe that their discovery will lead to the development of drugs that aim at nicotine receptors on brain cells that control appetite. In the future, weight gain may no longer be a reason for smokers to delay the decision to kick the habit, but that's no reason to wait. Nicotine-replacement treatment, while not for everyone, can help. Here are a few more ways to quit smoking and stay slim. Drink water. To improve metabolic rates, make half of those glasses ice water. Juice can be too high in calories, something you'll want to keep an eye on your journey toward being a slimmer non-smoker. Plan your snacks. Healthy snacks help keep your metabolism working, so you continue to burn calories while stopping wild hunger pain, or fake hunger. Keep moving. Exercise kills two birds with one stone. It helps you burn calories and prevents you from eating when you're not truly hungry. It's also a feel-good stress reliever . Focus on your fitness and how being healthy makes you feel. Make exercise a goal and think of quitting as your reward for being physically fit.
Answer: Nicotine.

SOLUTION:
Which of the following changes people's appetite according to the new research?