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.

Q: Article: THURSDAY, July 9 (Health Day News) -- A new study that found that a lower calorie diet slowed the aging process in monkeys could be the best proof yet that restricted diets might do the same for humans. "The big question in aging research is, 'Will caloric restriction in species closely related to humans slow aging?'" said Richard Weindruch, senior author of a paper appearing in the July 10 issue of Science. This is the first clear demonstration that, in a primate species, we' re inducing a slowdown of the aging process -- showing increased survival, resistance to disease, less brain atrophy and less muscle loss. "This predicts humans would respond similarly," added Weindruch, professor of medicine at the University of Wisconsin and an investigator at the Veterans Hospital in Madison. Another expert noted that, despite some highly publicized studies in certain species, the link between restricted eating and longer lifespan has been far from proven. "The idea that dietary restriction extends lifespan in all species is not true. Many strains of rats and mice do not respond. In some strains, it' s actually deleterious," explained Felipe Sierra, director of the biology of aging program at the US National Institute on Aging (NIA), which supported the new study. "The fact that it doesn't work in some mice but it does seem to work in monkeys is surprising and it gives us hope." But there's a larger question: how to change humans' increasingly careless eating habits. "This finding doesn't give me hope that humans are going to go into dietary restriction," added Marianne Grant, a registered dietitian at Texas A&M Health Science Center Coastal Bend Health Education Center in Corpus Christi.
Answer: This experiment indicates restricted diets could extend humans' lifespan.

A: Which of the following statements about Weindruch is true?
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Q: Article: Former South African President Nelson Mandela who was treated for a recurring lung infection, dies on Dec. 5th, 2013, at the age of 95. People around the world are mourning the loss of the country's first black president. He was often called humble, charming, loyal person and a man who cared about others. "He seemed to have that special charismatic personality," said Herman Cohen, U.S. assistant secretary of state for Africa from 1989 to 1993. "He became the symbol in the fight against _ ." Mandela was born on July 18, 1918. As a young man he became active in the anti-apartheid movement and joined the African National Congress, or ANC, in the 1940s. The white-led government banned the ANC in 1960, but the group continued to operate secretly. Mandela became head of the group's new military wing, coordinating a sabotage campaign against South African military and government targets. In 1962, he was arrested and put on trial for his actions and sentenced to life in prison on Robben Island off the coast of Cape Town. He spent 18 years there, refusing a government offer to release him if he would renounce the ANC's armed struggle. But he was freed in 1990 after South African President Frederik de Klerk legalized all political parties and discharged most political prisoners. Shortly after his release, Mandela was elected president of the African National Congress. And in 1994, when the ANC won South Africa's first all-race elections, he was inaugurated as the county's first black president at age 75. "Never, never and never again shall it be that this beautiful land will again experience the oppression of one by another," he said. President Mandela said he would stay for only one five-year term. Cohen says Mandela earned international respect for South Africa's national reconciliation. "Mandela devoted himself mainly to rallying the Africans to this new era to work on economic development, having good education, also he was very much of a spokesman on the international scene." he said. In 1993, Mandela shared the Nobel Peace Prize with his once bitter enemy F.W. de Klerk for their contribution to the peace process in South Africa. After receiving the award, Mandela praised the South African people. "All have created a society which recognizes that all people are born equal," he said. In a country torn apart by years of racial conflict, Nelson Mandela is considered a remarkable leader -- a man who turned South Africa away from violence and hatred into a country of greater peace and understanding.
Answer: 28 years

A: How long was Nelson Mandela sent to prison?
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Q: Article: Sometimes having a teenager at home can be a real headache. Many teenagers smoke, drink, wear strange hairdos and even fight. Basically, they are often taking risks. Earlier studies have shown that teenagers are more likely to make _ decisions than people from any other age group, including children and adults. Is it that teenagers are too young to tell right from wrong? Not really. So what explains their risky behavior? According to Laurence Steinberg, a professor at Temple University, US, the reason is that teens care a lot about how their peers view them - that's the effect of "peer influence", reported Science Daily. As children enter their teenage years, they spend more time with their friends and classmates and also become more sensitive to their feedback . This sensitivity drives teenagers to concentrate on the short-term benefits of making risky choices and overlook the costs. In a test, a group of teenagers were asked to play a video driving game. When they played with their friends watching, they took more chances and drove more carelessly because that would increase their possibility of winning. But when they played alone, they tended to drive more safely. Why does pressure from peers have such a big influence on teens' behavior? As Steinberg sees it, a teenager's brain is like a car with a good accelerator but a weak brake . The "accelerator", the brain's ability to notice the benefits of things, is fully developed by teenage years while the "brake", the brain part related to controlling impulses and long-term thinking, is still immature . When teens are under the pressure of being judged by their peers, they tend to push hard on the accelerator. Given how weak the brake is, it is likely that they are going to end up in a crash. But the good news here, according to Steinberg, is that a violent teenager doesn't necessarily become a violent adult. About two-thirds to three-quarters of violent youth grow out of it. "They get more self-controlled," Steinberg told Live Science. Also, people who haven't committed a violent crime by age 19 are less likely to start doing it later, added Steinberg.
Answer: Their brains are more sensitive to thrilling events.

A:
Why are teenagers likely to take risks according to the text?
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