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: 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: Perhaps the most extraordinary building put up in the nineteenth century was the Crystal Palace which was built in Hyde Park for the Great Exhibition of 1851. The Crystal Palace was different from all the other buildings in the world, for it was made of iron and glass. It was one of the biggest buildings of all the time and a lot of people from many countries came to see it. Plenty of goods were sent to the exhibition from all parts of the world. There was also a great deal of machinery on show. Though in those days, traveling was not as easy as it is today, steamboats carried thousands of visitors across the Channel from Europe. On arriving in England, they were taken to the Crystal Palace by train. There were six million visitors in all, and the money from the exhibition was used to build museums and colleges. Later the Crystal Palace was moved to the South London. It remained one of the most famous buildings in the world until it was burnt down in 1936.
Question: The Crystal Palace was built up _ .
Options: (A) in the 1950s (B) in the 1900s (C) shortly before 1851 (D) before 1951

Ex Output:
C

Ex Input:
Article: Nowadays everybody seems to think that they know English. Many people speak it but few speak it really well. Practice is necessary in speaking English well. Reading is also one of the things that will help you to speak English better. Read whenever you can and whatever you like! Read papers and Internet sites that you like in English every day. Then, you will see that the number of known words is increasing and you are able to speak with more skills. Then you will have made the foundations and a good basis of English. It is not good to stop and get stuck there. Going to England or an English speaking country is a good choice, but many people cannot afford it. If you cannot go, reading and speaking with your friends will also help you to practice your English. However, I think that it is very good to visit some English speaking country to see and test your knowledge in everyday life. You will feel the everyday usage of the language in its natural environment. There your level of English is going to improve even faster. Your ability to speak English is better. Nothing can match the excitement and happiness when a native speaker tells you that your English is very good! Finally, in order to speak English well, you must be persistent and do it every day. It is like playing the piano. Pianists play it every day and so should you. Include English in your life and you will see where it is going. Practice, practice! Read, write and improve your language skills and you are on your way when you will be able to speak it with more and more confidence!
Question: Which of the following could be the best title for the passage?
Options: (A) How to Improve Your Language Skills (B) How to Speak English Well (C) Speaking English (D) Practice, Practice

Ex Output:
B