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: Throughout your life, you spend the most time being with or dealing with yourself, but it is exactly yourself that you have the least understanding of. When you are going upwards in life, you tend to think too highly of yourself. When you are going downhill, you tend to have too low an opinion of yourself. It's likely that you think it wise for yourself to know your place and keep yourself from lacking courage to face whatever problem you meet with, in which case your energy and creativity would remain far from enough for your age. To get a thorough understanding of oneself is to gain a correct view of oneself and be a clear-minded realistic person-knowing both one's strength and shortage. You may look forward hopefully to the future but be sure not to expect too much, for dreams can never be fully realized. You may be brave to meet challenges, but it should be clear to you where to direct your efforts. To get a thorough understanding of oneself needs self-appreciation. Whether you hold yourself as a big tree or a thin piece of grass, whether you think you are a high mountain or a small stone, you show a state of nature that has its own reason of existence. If you really admire yourself, you'll have a real sense of self-appreciation which will give you self-confidence. As soon as you gain full confidence in yourself, you'll be enabled to fight and defeat any trouble that will otherwise defeat you. To get a thorough understanding of oneself also requires that you show yourself loving concern about your health and daily life. Unless you know perfectly well when and how to do yourself a favor, you won't be confident and ready enough even to resist the attack of illness. Therefore, just do yourself a favor whenever it's needed. In time of anger, do yourself a favor by giving an exit to it in a quiet place so that you won't be hurt by the anger itself; in time of sadness, do yourself a favor by sharing it with your friends so as to change a sad mood into a cheerful one; in time of tiredness, do yourself a favor by getting a good sleep or some other relaxation. All in all, to get a thorough understanding of oneself is to get a full control one's life. Then one will find one's life full of color1, pleasure and achievement.
Question: Where does our self-confidence come from?
Options: (A) Our self-appreciation. (B) Our courage to fight. (C) Our natural existence. (D) Our strength and shortage.

Ex Output:
A

Ex Input:
Article: Mark Twain left school when he was twelve. He had little school education. In spite of this, he became the most famous writer of his time. He made millions of dollars by writing. His real name was Samuel Langhorne Clemens, but he is better known to all over the world as Mark Twain, his penname. Mark Twain was born in 1835 and he was not a healthy baby. In fact, he was not expected to live through the first winter. But with his mother's care, he managed to survive. As a boy, he caused much trouble for his parents. He used to play jokes on all his friends and neighbors. He didn't like to go to school, and he often ran away from home. He always went in the direction of the nearby Mississippi. He was nearly drowned nine times. After his father's death, Mark Twain began to work for a printer, who only provided him with food and clothing. Then, he worked as a printer, a river-boat pilot and later joined the army. But shortly after that he became a miner. During this period, he started to write short stories. Afterwards, he became a full-time writer. In 1870, Mark Twain got married. In the years that followed he wrote many books including The Adventures of Tom Sawyer in 1876, and The Adventures of Huckleberry Finn in 1884, which made him famous, and brought him great fortune. Unfortunately, Mark Twain got into debts in bad investments and he had to write large numbers of stories to pay these debts. In 1904, his wife died, and then three of his children passed away. At the age of 70, his hair was completely white. He bought many white suits and neckties. He wore nothing but white from head to foot until his death on April 21, 1910.
Question: In Mark Twain's childhood, _ .
Options: (A) he learned a lot at school (B) his mother often worried about his safety (C) he often went swimming with other boys (D) he often played games with other boys

Ex Output:
B

Ex Input:
Article: In many sports, physical contact is part of the game. But when athletes hit their heads, the hit can cause concussions . Concussions have long been a concern for professional athletes, but they've become more common among young players too. Between 2001 and 2009, the number of kids under 19 visiting doctors for concussions each year increased by 62 percent. Engineers are developing new helmets , and new rules are limiting physical contact in some sports. But are these efforts enough to protect kids' brains? Concussions can happen during many types of activities. But sports like football and soccer are especially risky. When you run or jump, your body is moving at an increased speed. A sudden hit causes you to move faster in a different direction. "It's like when you're in a bus and it makes a sudden stop," says Dr. Kevin Crutchfield, an expert at a sports concussion center in Baltimore, Maryland. "You hit the inside of the bus." This hit damages the brain. It affects the way the brain functions. So some sports require athletes to wear helmets. Helmets help reduce the force of a hit. The hard outer shell spreads the force of larger area. Inside a helmet, a plastic or air-filled lining also helps soften the blow. Steve Rowson is an engineer at Virginia Tech. In his lab, he tests how helmets hold up against different types of hits. No helmet can prevent concussions completely, says Rowson. But he's found that when wearing a newer football helmet, the player's head doesn't gain speed as much after a hit. That lowers the risk of concussions. Many youth sports teams have set limits on physical contact to reduce the risk of concussions. In soccer, most concussions happen as a result of headers--shots or passes made with the head. That's why many people think kids shouldn't head the ball until high school. These efforts should help, says Crutchfield. But the best way to prevent long-term brain injuries, he says, is to stop playing immediately if you suffer concussion. "Protect yourself today so you can play again tomorrow."
Question: Concussions among young players _ .
Options: (A) are rare before 2001 (B) seem extremely worrying (C) cause kids to lose interest in sports (D) are mostly caused by wearing no helmets

Ex Output:
B