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.

Example Input: Article: There are many festivals in Argentina during the year. Therefore, you can enjoy the different interesting festivals when traveling there. First of all, we should talk about the Tango Festival in Argentina, which is held in the capital of this country -- Buenos Aires, from February to March. You ought to know that Argentina is the home of tango, so Argentineans admire this dance very much. Even if you cannot dance perfectly, you should join the people and try to perform this dance. The next festival in Argentina is Open Polo Tournament. You should go to Palermo to see this festival in Argentina. This festival is held every year and is the most important polo tournament in Argentina. This kind of sport is considered the most important in Argentina. Attending this festival in Argentina, you will be able to communicate with different people, admire the fascinating competition between the teams of different countries, such as Argentina, England, Australia, as well as the US. This festival in Argentina is usually held between November and December every year. So don't miss the opportunity if you travel to Argentina at this time. The other festival in Argentina is the Semana Musical Llao Llao. This is a festival of classical music. The festival was created in 1993 and is held at the Llao Llao Hotel, near Bariloche. The festival is held yearly in October. So if you admire this kind of music, you should travel to Argentina in October. There are also many carnivals in October. There are also many carnivals in Argentina in summer. Of course, it's impossible to put everything about festivals in Argentina into just one article. We hope that you have found this article interesting and eye-catching.
Question: What would be the best title for the passage?
Options: (A) Travel to Argentina (B) Entertainments in Argentina (C) Festivals in Argentina (D) A brief introduction to Argentina
Example Output: C

Example Input: Article: In many romantic movies or TV shows one scene always appears. It involves a handsome man standing outside a young woman's window, singing a love song to her to win her over. However, trying to woo a female with songs is not just something that humans do. A few animals sing love songs as well. Birds and elephants are romantic but the latest animal to _ a female might surprise you--it is the humble mouse. You may find it odd to find out that mice sing. We do not hear them because the frequency of their voice is so high. In fact, scientists have known for some time that male mice make special sounds to females, but it has always been assumed that the sounds are produced instinctively and randomly, with little thought going into the process. But new research suggests otherwise. When male mice with different voices were put in a cage together, scientists found that they would gradually change their pitches to sound like one another. But when a female mouse was put in the cage with two males, one male would change his pitch to match the other. "It was usually the smaller animal changing the pitch to match the larger animal," professor Erich Jarvis, leader of the study, from Duke University, US, told BBC News. This ability, known as vocal learning, is rare in the natural world. It had been thought to be limited to some birds, such as parrots--as well as whales and dolphins. The latest findings challenge the long-held opinion that mice cannot learn to adapt their voices. Scientists also found the part of the brain that controls the mice's singing ability. In the experiment, they damaged the cells in this part of the mice's brain and found that the animals couldn't keep their songs in pitch or repeat them any more. This also happened when the mice became deaf. Jarvis said that this finding had changed his understanding of the way mice make sound. "In mice we find that the pathways that are at least modulating these vocalizations are in the forebrain, in places where you actually find them in humans," he said. "If we're not wrong, these findings will be a big boost to scientists studying diseases like autism and anxiety disorders."
Question: Which of the following is proven wrong by the latest discovery?
Options: (A) The frequency of mice's voice is so high that it's impossible for humans to hear it. (B) When male mice make special sounds to females they can't control the sounds. (C) Birds and elephants are both romantic animals that are good at expressing love. (D) Animals like mice are smart even though they often make sounds randomly.
Example Output: B

Example Input: Article: Every summer, no matter how urgent work schedule is, I take off one day exclusively for my son. We call it dad-son day. This year our third stop was the amusement panic, where we discovered that he was tall enough to ride one of the fastest roller coasters in the world. We experienced through face-stretching turns and circles for ninety seconds. Then, as we stepped off the ride, in a calm voice, he remarked that it was not as exciting as other rides he'd been on. As I listened, I began to sense something seriously out of balance. Throughout the season, I noticed similar events all around me. Parents found it hard to find new stimulations for cold kids. Surrounded by ever-greater stimulation, their young feces were looking disappointed and bored Facing their children's complaints of "nothing to do", parents were spending large numbers of dollars for various forms of entertainment In many cases the money seemed to do little more than buy relief from the terrible complaint of their bored children. This set me thinking the obvious question: "How can it be so hard for kids to find something to do when there's been such a range of stimulating entertainment available to them?" What really worries me is the strength of the stimulation. I watch my little daughter's &ce as she absorbs bloody special effects in movies. Why do children facing such excitement seem starved for more? Thai was, I realized, the point I discovered during my own adolescence that what creates excitement is not going fast, but going faster. Excitement has less to do with speed than changes in speed. I am concerned about the increasing effect of years at these levels of feverish activity. It is no mystery to me why many teenagers appear uninterested and burned out, with a "been there, done that" air of indifference toward much of life. As increasing numbers of friends' children are advised to take medicine to deal with inattentiveness at school or anti-depressants to help with the loss of interest and joy in their lives--I question the role of kids' boredom in some of the diagnoses . My own work is focused on the chemical imbalances and biological factors related to behavioral and emotional disorders. These are complex problems. Yet I've been reflecting more and more on how lie pace of life and the strength of stimulation may be contributing to the rising rates of psychological problems among children and adolescents in our society.
Question: The reason why the author felt surprised in the amusement park was that _ .
Options: (A) his son was not as excited by the roller coasters ride as expected (B) his songs enjoyed turns and circles with his face stretched (C) his son appeared upset but calm while riding the roller coasters (D) his son could keep his balance so well on the fast moving roller coasters
Example Output:
A