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.

Ex Input:
Article: Social media is one of the fastest-growing industries in today's world. A study conducted by the US think tank Pew Research Center showed that 92 percent of teenagers go online daily. The wide spread of social media has changed nearly all parts of teenagers' lives. Changing relationships High school student Elly Cooper from Illinois said social media often reduces face-to-face communication. "It makes in-person relationships harder because people give attention to their phones instead of their boyfriends or girlfriends," Cooper said. There's also a greater possibility of things getting lost in translation over social media. "If half of your relationship is over social media, you don't really know how the other person is reacting," Sienna Schulte, a junior student from Illinois, said. Yet, some people believe social media has made it easier to start relationships with anyone from anywhere. Beth Kaplan from Illinois met her long-distance friend through social media. He currently lives in Scotland, but they're still able to frequently communicate with one another. "I can feel close to someone that I'm talking to via FaceTime," Kaplan said. Wanting to be "liked" The rise of social media has changed the way teenagers see themselves. The 19-year-old Essena O'Neill announced on the social networking service Instagram that she was quitting social media because it made her obsessed with appearing perfect online. Negative comments also can do great damage to a teenager's self-esteem . In particular, anonymous social media apps such as Yik Yak may provide opportunities for cyber bullying . The app allows users within 5 miles (8 km) to create and add comments to everything. Teenagers who get negative comments on these sites can't help but feel hurt. Opening new doors However, Armin Korsos, a student from Illinois, takes advantage of the comments he receives over social media to improve his videos on the social networking site Youtube. "Social media can help people show themselves and their talents to the world in a way that was never possible before," Korsos said. But Korsos recognizes that social media has become a distraction . "Social media, though it helps people connect with their friends and stay updated, is not all necessary."
Question: What is the article mainly about?
Options: (A) The major problems with social media. (B) The impact of social media on teenagers. (C) How teenagers benefit from social media. (D) Why social media appeals so much to teenagers.

Ex Output:
B

Ex Input:
Article: We use both words and gestures to express our feelings, but the problem is that these words and gestures can be understood in different ways. It is true that a smile means the same thing in any language. So does laughter or crying. There are also a number of striking similarities in the way different animals show the same feelings. Dogs, tigers and humans, for example, often show their teeth when they are angry. This is probably because they are born with those behavior patterns. Fear is another emotion that is shown in much the same way all over the world. In Chinese and in English literature, a phrase like "he went pale and begin to tremble" suggests that the man is either very afraid or he has just got a very big shock. However, "he opened his eyes wide" is used to suggest anger in Chinese whereas in English it means surprise. In Chinese "surprise" can be described in a phrase like 'they stretched out their tongues!' Sticking out your tongue in English is an insulting gesture or expresses strong dislike. Even in the same culture, people differ in ability to understand and express feelings. Experiments in America have shown that women are usually better than men at recognizing fear, anger, love and happiness on people's faces. Other studies show that older people usually find it easier to recognize or understand body language than younger people do.
Question: According to the passage, _ .
Options: (A) we can hardly understand what people's gestures mean (B) we can not often be sure what people mean when they describe their feelings in words or gestures (C) words can be better understood by older people (D) gestures can be understood by most of the people while words can not

Ex Output:
B

Ex Input:
Article: As many people hit middle age, they often start to notice that their memory and mental attention are not what they used to be. We suddenly can't remember where we put the keys just a moment ago, or an old friend's name, or the name of an old band we used to love. It happens to most of us, but is it unavoidable? Scientists are increasingly showing that there's actually a lot that can be done. It turns that the brain needs exercise in much the same way as our muscles do, and the right mental workouts can improve our basic cognitive functions. Now, a new San Francisco Web-based company has taken it a step further and developed the first "brain training program" designed to actually help people improve and regain their mental sharpness. Called Lumosity, it was designed by some of the leading experts from Stanford University. Lumosity is far more than an online place to exercise your mental skills. That's because they have combined these exercises with a Web-based program that allows you to systematically improve your memory and attention skills. Apparently it works. One study showed students improved their scores on math tests by 34 percent after using Lumosity for six weeks, greater gains than those made by other students in the same class, who were not training with the Lumosity program. The company says its users have reported clearer and quicker thinking, improved memory for names, numbers, directions, increased alertness and awareness, high mood, and better concentration at work or while driving.
Question: What is the purpose of Lumosity?
Options: (A) To exercise the brain and muscles. (B) To combine exercises with a web-based program. (C) To improve basic cognitive functions. (D) To improve students' scores on test.

Ex Output:
C