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.
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Question: Article: China is the biggest market in the world, and many countries such as Germany, the USA, the UK and Russia do a lot of business in China. Let's have a look at some important tips to help you be successful when dealing with these nationalities. First, you must be punctual with Germans. Even 5 minutes late makes a bad impression. Being punctual is also very important in the USA. In the UK, it's important to be punctual for business meetings, but nobody expects you to be on time for a social event. Half past seven really means a quarter to eight, or even eight o'clock! With Russians, you should always be on time, though it is not unusual for them to be one or even two hours late! It is best to dress formally and wear dark colours when you meet people from all the four countries. In Russia, designer clothes are very common. Don't be surprised if you go to an office in the UK on a Friday and find everyone wearing jeans. Many companies have "dress down Friday", when people wear casual clothes. In Germany, first names are only used by family members and close friends, so be prepared to use titles and last names. In the USA you will usually be invited to use first names almost immediately. The British are quite informal and using first names in business is more and more common, especially among younger people. In Russia, however, nobody uses first names, so use titles and last names. In conversation, the British and the Americans value humour, and both like to talk about sport. The weather is also a good topic of conversation with the British and the Americans, but avoid talking about politics. In Russia, say positive things about their country, but avoid making complaints. The Germans, however, prefer to get straight down to business! So, use these tips, and you will be on your way to a successful international business career!
Answer: White.

Answer: Which color should you NOT wear when meeting a person from the USA?

Question: Article: Women are friendly. But men are more competitive. Why? Researchers have found it's all down to the hormone oxytocin . Although known as the love hormone, it affects the sexes differently. "Women tend to be social in their behavior. They often share with others. But men tend to be competitive. They are trying to improve their social status," said Professor Ryan. Generally, people believe that the hormone exytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interaction such as falling in love or giving birth. But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy. Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships, but in women it raises the ability to recognize friendship. Professor Ryan's recent experiment used 62 men and women aged 20 to 37. Half of the participants received oxytocin. The other half received placebo . [( )] [( :Love my Dog.)] After a week, the two groups switched with participants. They went through the same procedure with the other material. Following each treatment, they were shown some video pictures with different social interactions. Then they were asked to analyze the relationships by answering some questions. The questions were about telling friendship from competition. And their answers should be based on gestures, body language and facial expressions. The results indicated that, after treatment with oxytocin, men's ability to correctly recognize competitive relationships improved, but in women it was the ability to correctly recognize friendship that got better. Professor Ryan thus concluded: "Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions. And the behavior differences between men and women are caused by biological factor that are mainly hormonal."
Answer: Oxytocin.

Answer: What causes men and women to behave differently according to the text?

Question: Article: For decades, public health officials have puzzled over a surprising fact about HIV: Only about 10-20 percent of infants who are breastfed by infected mothers catch the virus. Tests show, though, that HIV is indeed present in breast milk, so these children are exposed to the virus multiple times daily for the first several months of their lives. Now, a group of scientists and doctors from Duke University has figured out why these babies don't get infected. Human breast milk naturally contains a protein called Tenascin C that neutralizes HIV and, in most cases, prevents it from being passed from mother to child. Eventually, they say, the protein could potentially be valuable as an HIV-fighting tool for both infants and adults that are either HIV-positive or at risk of contracting the infection. The research, published in Proceedings of the National Academy of Sciences, was inspired by previous work by other researchers showing that, both in tissue cultures and live mice, breast milk from HIV-negativemothers was naturally endowed with HIV-fighting properties. Scientists suggested that a few different proteins in the milk could potentially be responsible, but no one knew which one. As part of the study, the researchers divided breast milk into smaller fractions made up of specific proteins via a number of filters -- separating the proteins by size, electrical charge and other characteristics--and tested which of these fractions, when added to a tissue culture, prevented the cells from being infected by HIV. Eventually, they found that one particular protein was present in all the HIV-resistant fractions but in none of the others: Tenascin C. Tenascin C works by blocking a key protein on HIV's envelope that normally ties up to a receptor on a T cell's membrane called CCR5. In doing so, Tenascin C prevents HIV from mixing with the T cell and injecting its RNA inside. Still, the researchers say that other natural elements in milk might play a role in fighting HIV as well. "It's clearly not the whole story, because we do have samples that have low amounts of this protein but still have HIV-neutralizing activity," the study's lead author Permar says. "So it may be acting in concert with other antiviral and antimicrobial factors in the milk." Whatever those other factors are, though, the finding vindicates (......) recent changes to UN guidelines that recommend even HIV-positive mothers in resource-poor countries should breastfeed, if they're taking anti-retroviral drugs to combat their own infection. The next steps, Permar says, are determining which area of Tenascin C is active and whether it can effectively prevent transmission in a live animal. If it works, it could potentially be incorporated into an HIV drug with broader applications. It's even possible that it could someday be adapted to reduce the risk of HIV transmission in adults as well as infants.
Answer: It can sometimes prevent mother-to-child transmission of HIV.

Answer:
Which of the following about Tenascin C is true?