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: Researchers in over 80 nations are taking part in a project to conduct a decade-long census of sea life. Scientists presented some of their findings at a recent conference as the project neared its completion. In deep icy waters under Antarctica, scientists found bulbous tunicates, an underground animal, and many newly-discovered creatures believed to be related to starfish and other marine creatures. Elsewhere in the world's oceans, they have recently discovered many kinds of underwater life forms new to science. It is all part of a research effort called the Census of Marine Life. "There are about 2,000 scientists worldwide involved," said Bob Gagosian, President, CEO of the Consortium for Ocean Leadership. Gagosian helps manage the project. "Everywhere they've gone they've found new things," he says. "The ocean basically is unexplored from the point of view of marine living things." Researchers have placed small markers on hundreds of fish and marine animals to track by satellite their migration routes and to discover places where sea life gathers. According to Ron O'Dor, a senior scientist with the Census of Marine Life, knowledge of life on the ocean floor is especially limited. "90% of all the information we have is from the top hundred meters of the ocean," O'Dor states. And he says the sea floor is, on average, at a depth of 4, 000 meters. And so, as some machines dive far below what people have previously seen, scientists are discovering new species of plants, animals and living things. Since the census project began, more than 5,300 new marine animals have been found. Ocean researchers say they hope to catalogue 230,000 species during the census --which some say is only a small part of all the creatures living in the sea.
Question: Why do the researchers place small markers on many marine creatures?
Options: (A) To catch them. (B) To research them. (C) To kill them. (D) To protect them.

Ex Output:
B

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: The Italian island of Sardinia recently lost its oldest citizen. Family members say Antonio Todde died in his sleep early this month. Mr. Todde was 112 years old. It was less than three weeks away from his 113thbirthday. Record-keeping experts say he was the world's oldest man. His long life and that of other very old Sardinians are the subjects of a scientific project called Akea. Luca Deiana of Sassari University is directing the study. He says the name Akea comes from a traditional greeting on Sardinia. It means"health and life for 100 years". Professor Deiana and his team started to collect information for the study in 1997. They identified more than 220 Sardinians who were centenarians--100years old or older. His team required three documents to confirm a person's age. They were a government birth record, a church record and a statement by a close family member. The Akea study has produced two major findings. The first is Sardinia's extremely high number of centenarians. The island had about 135 centenarians for every one million people. In other Western countries, the average is about seventy five centenarians for every one million people. The second major finding is an unusual rate of female to male centenarians. Sardinia has two women centenarians for every male centenarian. In central Sardinia there are equal numbers of female and male centenarians. Studies in other parts of the world have shown a much higher percentage of female centenarians. The Akea study collected information about the health and diet of about 140 of the centenarians. About ninety percent of those in the study agreed to provide blood for scientific testing. The study team hope to identify genetic material in the blood that can be linked to successful aging. Study leaders say there is no single reason why people on Sardinia live so long. They believe the answer is a combination of genetic and environmental conditions.
Question: Centenarians refer to people who are _ years old.
Options: (A) 100 (B) 200 (C) 300 (D) 400

Ex Output:
A