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: On a Friday night, a poor young artist stood at the gate of the New York railway station, playing his violin. The music was so great that many people stopped to put some money into the hat of the young man. The next day, the young artist came to the same place, and put his hat on the ground gracefully. Different from the day before, he took out a large piece of paper and laid it under his hat. Then he began to play the violin. It sounded more pleasant than ever. Soon he was surrounded with people who were attracted by the words on that paper. It said, "Last night, a gentleman named George Sang put an important thing into my hat by mistake. Please come to claim it soon." After about half an hour, a middle-aged man rushed through the crowd to the violinist and said, "Yes, it's you. I knew that you were an honest man and would certainly come here." The young violinist asked calmly, "Are you Mr. George Sang?" The man nodded. The violinist asked, "Did you lose something?" "It's a lottery ticket," said the man. The violinist took out a lottery ticket on which George Sang's name was seen. "Is it?" he asked. George nodded and took the lottery ticket and kissed it, then danced with the violinist. The violinist was a student at an arts college and had planned to attend advanced studies in Vienna. Later his classmate asked the violinist, "At that time you needed money to pay the tuition and you had to play the violin in the railway station every day to make money. Why didn't you keep the lottery ticket for yourself?" The violinist said, "Although I don't have much money, I live happily. But if I lose honesty I won't be happy forever." Through our lives, we can gain a lot and lose so much. But being honest should always be with us.
Question: What did the young artist do at the railway station on Friday?
Options: (A) He played the violin to make some money. (B) He waited for the train to Vienna. zxxk (C) He came to buy a train ticket to Vienna. (D) He walked around the New York railway station.
Example Output: A

Example Input: Article: On the morning of November 18, 1755, an earthquake shock Boston. John Winthrop, a professor at Harvard College, felt the quake and awoke. "I rose", Winthrop wrote, "and lighted a candle, looked at my watch, and found it to be 15minutes after four." John Winthrop hurried downstairs to the grandfather clock. It had stopped three minutes before, at 4:12. Except for stopping the clock, the quake had only thrown a key from the mantel to the floor. The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the case for safekeeping. The quake had knocked the tubes over and blocked the pendulum .Winthrop, therefore, had the key on the floor. The quake had thrown _ forward in the direction of the quake' s motion by a shock coming from the northwest, perhaps in Canada.
Question: The selection suggests that _ .
Options: (A) earthquakes are common in Boston (B) John Winthrop was a scientist (C) John Winthrop often had difficulty in sleeping (D) Harvard College was a center for earthquake researching
Example Output: B

Example Input: Article: Passport Control If you are arriving at London Heathrow Airport and are not _ to another flight outsideprefix = st1 /BritainorNorthern Ireland, you must pass through Passport Control and Customs immediately after leaving your plane. If you are not Britain or a citizen of the European Community ,you must fill out a special form before your passport is examined. This form is called a landing card and should be given to you during the flight to London. After landing, follow the ARRIVALS signs. Make sure you are in the right channel when you reach Passport Control. There is one channel for holders of European Community Passports, and a second channel marked "Other Passports". Baggage Reclaim Area After passing through the Passport Control, follow the signs to the Baggage Reclaim Area. If you have luggage which is carried in the aircraft hold, it will be delivered to you in the Baggage Reclaim Area. Look for the sign with your flight number. If you have only hand luggage, go directly through the Baggage Reclaim Area to the Customs.Customs All passengers must pass Customs after Passport Control. There is a choice of two channels: Green and Red. If you have nothing to declare, go through the Green Channel. If you are not sure about your Duty Free allowance or if you have something to declare, go through the Red Channel. Information about Duty Free allowance can found on special notice - boards in the Baggage Reclaim Area. You should study this information carefully whether you are going through the Red Channel or not. Please note that if you go through the Green Channel, you may be stopped and asked to open your luggage for inspection.
Question: All passengers arriving at Heathrow from outside Britain_.
Options: (A) must go through either Passport Control or Custom (B) must go through Customs, but not Passport Control (C) must go through Passport Control and Customs (D) don't have to be examined
Example Output:
C