user: Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer, saying studies showed a clear link. "Our suggestion is for people to increase their intake, through diet or a vitamin supplement," Dr. Cedric Garland said in a telephone interview. Garland's research team reviewed 63 studies, including several large long-term ones, on the relationship between vitamin D and certain types of cancer worldwide between 1966 and 2004. "There's nothing that has this ability to prevent cancer," he said, urging governments and public health officials to do more to fortify foods with vitamin D.Garland is part of a University of California at San Diego Moores Cancer Center team that published its findings this week online in the American Journal of Public Health.    Vitamin D is found in milk, as well as in some fortified orange juice, yogurt and cheeses, usually at around 100 international units (IU) a serving. People might want to consider a vitamin supplement to raise their intake to 1000 IUs per day, Garland said, adding that it was well within the safety guidelines established by the National Academy of Sciences. The authors said that taking more vitamin D could be especially important for people living in northern areas, which receive less vitamin D from sunshine. African Americans, who don't produce as much of the vitamin because of their skin colour, could also benefit significantly from a higher intake, the authors said. Options: A Have more meat B Have some sunshine C Have a vitamin supplement D Have more fortified cheese Answer: A Have more meat Question:
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The answer is:
Which of the following can not help people get more Vitamin D?


Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Oprah Winfrey, the queen of American daytime talk TV, is considered one of the most powerful women in the world.Now, after 25 years' hosting The Oprah Winfrey Show, the star has announced she is calling it quits. According to the Los Angeles Times, the move "signals the beginning of the decline for the daytime talk show." More women are working full-time jobs, and people are turning to cable   and pre-recorded shows for their entertainment. It may be that Oprah isn't quitting so much as moving on.She has created the Oprah Winfrey Network (OWN), and will most likely move her show to the network.If audiences around the world need Oprah, they well know where to look. Oprah Winfrey was born to a single teenage mother in a small town in rural Mississippi, US.As a child, she lived with poverty and abuse.But she got a job at a local radio station, where her honesty, emotional style won her many fans.She quickly rose through the ranks of radio and television before launching her own production company and starting her own show. Oprah's talk show was not the first of its kind, but it quickly became the best and most popular.It made talk shows popular, and others jumped in to start similar shows.But while other talk shows turned ugly, featuring guests who argued and attacked each other with chairs, _  "Part of her power lies in the fact that her life story resonates   with her audience, as a kind of version of the American dream," writes Kevin Connolly, a reporter with the BBC. She became a star because of the way she opened up about her problems to her audience.She shared her own struggles with relationships and weight.She focused on self-help.Connolly believes "something in her honesty and her sometimes painfully emotional directness struck home with a certain type of American". Options: A The stop of Oprah's show reflects the decrease of audience. B Oprah hosted her show for about 25 years. C American talk show was pioneered by Oprah. D Oprah used to be a radio presenter. Answer: C American talk show was pioneered by Oprah. Question:
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The answer is:
Which of the following statements is NOT true?


Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Most schools ban chewing gum,but in a few years they might consider changing that rule.Why? Scientists are finding evidence that gum chewing may be good for your health.It may even help boost your test scores. This exciting research is just beginning.And in the meantime,companies are also experimenting with adding vitamins,minerals,medicines,and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath. People have been chewing gum for thousands of years.Ancient Greeks,Mayas,and Native Americans,for example,chewed on the sap,or resin of certain types of trees.Today gum is a litde more complicated.Gum manufacturers start by mixing resin,wax,and a molecule called polyvinyl acetate to make a gum base.By varying the types and amounts of these ingredients,scientists can make thousands of formulations. Just what can gum do for your health?Many studies show that chewing gum after meals fights cavities by stimulating the production of saliva.Saliva helps wash away bacteria that damage our teeth.An ingredient called xylitol,which is added to it,provides an extra dose of cavity-fighting power.This is good for more than just the teeth.Research suggests that good oral health decreases the risk of heart disease,and other serious diseases. Chewing gum might also be good for your brain.Chewing gum boosts the flow of blood to participants'brains by 40 percent. But too much chewing can damage the jaw joint.And chewing too much of gum that contains vitamins,caffeine,or a medicine could lead to an overdose.What's a more,no matter how healthy gum chewing proves to be,it will never be a match for a healthy lifestyle. Nothing like gum or a vitamin is going to cure a bad dietary habit or a bad exercise habit;it's not a magic bullet. Options: A By making people brush teeth immediately after meals. B By killing bacteria that are harmful to our teeth. C By making people produce more saliva. D By adding some more medicines to the gum. Answer: C By making people produce more saliva. Question:
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The answer is:


assistant: How does chewing gum fight cavities?