In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Input: Consider Input: Article: One of my China Dialogue colleagues in Beijing recently bought a Philips energy-saving light bulb to replace a standard one.He was happy with his choice.It may have cost 30 yuan (just under US$4.50) - ten times the price of a filament bulb - but he wanted to save energy as part of his low-carbon lifestyle.And according to the shopkeeper, he would save, in the long run, much more than the 30 yuan he was spending. Yet only one month later, his expensive light bulb blew up, before he had saved even a small part of the purchase price.Will he stick to his high-cost, low-carbon lifestyle? China's environmental organizations have started to advocate low-carbon lifestyles and the decrease of carbon footprints to help fight against climate change.But they have overlooked one fact: in China, low-carbon living comes at a high cost.It means buying energy-saving bulbs and appliances, and environmentally friendly building materials and daily goods.Cost can no longer be the only standard for purchases.An energy-saving and environmentally friendly product is more expensive than a standard alternative - whether it's a simple light bulb or the house it shines.For average consumers, even buying an ordinary bulb is a huge burden.How can we persuade ordinary people to choose an energy-saving residence? This is not a trend they can afford to follow; perhaps this fashion is only for the rich. Most consumers today do not cause huge carbon dioxide (CO2) emissions.Their responsibility lies not in choosing a low-carbon lifestyle today, but in avoiding a high-carbon life in the future.The principle of "common but differentiated responsibility" - a basis of sustainable development - can be applied here as well. In China, low-carbon living still is resisted by a lack of social infrastructure . Even if your salary allows you to make that choice, nobody is there to help you accomplish it. Consider energy-saving homes. You need to find out whether or not the developer has used natural materials wherever possible; how effective the insulation(, ) is; and what the green credentials of installed equipment are.You can read up a little, but you'll still be lucky to avoid being puzzled by the developers' marketing.Many so-called energy-saving buildings are nothing of the sort, and some are even more energy-hungry than the average home - as Li Taige warned in his article "Energy-efficient buildings? Not always", on China Dialogue last August.
Question: What may probably be the best title of this passage?
Options: (A) To purchase a cheap bulb - your wise alternative. (B) To choose an energy-saving residence - a must of your life (C) To learn a low-carbon lifestyle - each citizen's responsibility (D) To learn a low-carbon lifestyle - a promising but difficult purpose

Output: D

Input: Consider Input: Article: Remember, from the moment they are born, our children have the ability to know when they are hungry - and they cry to let us know too! Of course, they also cry to let us know they are wet, hurt, or bored, but we soon learn to tell the difference and try to meet each need somehow. When we begin to feed them solid foods, they let us know when they have had enough by turning away from the spoon - or refusing the food back at us! Why is it that once children are old enough to sit at the table their parents are often heard bargaining with them or threatening them to finish all their dinner? When we make our children eat up the plate that we filled, we don't pay attention to their born ability to know how much, and what, their bodies need. Instead, we should allow them to use their own hunger feelings to determine how much they need, while we provide a balance of nutritious and "fun" foods. When we teach them about moderation and set a great example by living an active, healthy lifestyle, they will be less likely to develop weight problems later in life. Think of your slim friend who eats whatever she wants -but will refuse ice cream if she has had enough to eat! "Eat all your dinner if you want dessert" translates to "you must overeat so I will reward you by letting you overeat some more!" By using sweets as a reward for good behavior, kids begin to believe sweets are really special and they may want them even more. Instead, by making dessert just another (small) part of an enjoyable meal, kids learn to "save room for dessert" instead of becoming a member of the "clean plate club."
Question: Children are born to know _ .
Options: (A) how to stay away from poison (B) how much they should take when hungry (C) meat is worse than vegetables (D) sugar is better than fat

Output: B

Input: Consider Input: Article: Research by the Institute of Education (IOE) in London found that men who went to single-sex schools were not only more likely to be separated from a partner or divorced, but also more likely to be depressed by middle age. The chances of women having successful marriages were not affected by whether they were educated in mixed or single-sex schools.Separate research by the IOE found that going without boys was beneficial for women in other ways since there was a " statistically significant positive association between single-sex schooling and wages for women". The study into marital success interviewed 17,000 adults who were taught in a range of schools including private boarding schools to state comprehensives.It found that single-sex education does not compromise the chances either of men or women of getting married. However, researchers found that boys educated on their own were more likely to divorce in later life.While for women, there was no significant link.The research also found men taught in boys' schools were more likely to suffer from depression by age 42--perhaps because of their increased chances of marital breakdown.But Professor Leonard's team was unable to identify why those men educated in a single-sex environment were more likely to divorce. The study asked married and _ g couples where men had attended both single-sex and mixed schools to rate how happy they were and found no marked difference in their happiness levels or willingness to share domestic chores. Mary Boust, general secretary of the Association of Teachers and Lecturers, said the IOE research confirmed what was always suspected."All the research shows single-sex schools are good for girls but bad for boys--both in terms of academic performance and socialization," she said."Boys learn better when they are with girls and they actually learn to get on better." The findings were presented at a conference on gender in education hosted by Perse School for Girls in Cambridge.
Question: The researches made by the IOE indicate that _ .
Options: (A) school model has little influence on women's marriage (B) education is the main cause of middle age depression (C) boys in single-sex schools are more likely not to get married (D) mixed schools arc ly better than single-sex schools
Output: A