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: She might not be paid, but Carnegie Mellon University's newest staff member does all that a typical receptionist can do: give directions, answer the phone -- and even gossip about her life. University officials revealed what it considers to be the world's first robot receptionist with a personality of her own. The blond receptionist, named "Valerie," puts on a headset and interacts with people by talking about her boss, her psychiatrist and her dream. Valerie, the roboceptionist, sits in a custom-made booth at the entrance of a computer science hall. With her ability to distinguish motion, she greets visitors as they come near. Type in a question on a keyboard and she gives directions around the Pittsburgh campus and provides visitors information about the weather. More than that, she tells stories about her life. From her booth, passers-by often can hear her talking on the phone. She recognizes when someone is in front of her and remembers their characteristics. She can change between tasks from talking on the phone to answering a question. Valerie, however, does have her limit. She is a drum-shaped mechanical device with a digitally lively face that appears on a computer display. Visitors have to type on a keyboard to communicate with her. And she understands only simple questions. Eventually her creators would like to install face recognition so people don't have to insert an identity card for her to remember them. And people won't have to type their questions on a keyboard if they can solve the problem of voice recognition in a crowded hall. Valerie will tell the story of a robot living in a human world.
Question: According to the passage we know that _ .
Options: (A) Valerie looks like a real beautiful woman (B) Valerie can do whatever a human receptionist can't (C) Visitors can have a conversation with Valerie (D) Valerie doesn't understand of the visitors' questions sometimes
Example Output: D

Example Input: Article: Ibrahim became disabled after contracting polio when he was three years old. At first his parents, like many other parents of disabled children in Niger, did not want to send him to school. They were worried he would be laughed at by his classmates. Despite his disability, and his parents' doubts, Ibrahim was determined to go to school. "When I was eight," Ibrahim says, "other kids of my age were going to school while I stayed at home. I did not like that. So, I pestered my parents until they finally let me go to school." Ibrahim's parents sent him to a private school nearby. Although the journey to and from school was a short one, it still wasn't easy for Ibrahim. He had to use his hands to help him move along, protecting them with plastic slippers. But at least he was getting an education. However, after only a year in school, Ibrahim's education was interrupted when his parents separated. His mother did not have the means to continue paying for his tuition. In 2007, Ibrahim received some money to be fitted with a leg brace , corrective shoes and his first pair of crutches . Now that he was more mobile than before, the most important thing for him was to find a way to go back to school. "I wanted to start school again last October," Ibrahim says. "After my mother told me she could not afford it, I went to visit some of my relatives for support. And I collected 5,000 francs CFA (US $8) to pay my tuition for half a year. I will find the rest of the money somehow." Ibrahim attends a school in which he is the only disabled student. According to his teacher, he is among the top five students in a class of 55.
Question: Why did Ibrahim's parents prefer Ibrahim to stay at home?
Options: (A) There was a lot of housework for him to do. (B) They had no money to pay for his tuition. (C) There were not enough schools in the country. (D) They were afraid the students would make fun of him.
Example Output: D

Example Input: Article: Searching for love is no longer just a favorite subject for songs. It has also become a huge industry. Researchers say the online dating industry in the US earned 649 million dollars in 2006. They expect this number to increase to more than 9 million dollars by 2011. Experts say that the industry has grown because traditional social ties have weakened. Many young people leave behind a close community of friends and family to find work in bigger cities. People work longer hours, so they have less time to meet new people. This helps explain the popularity of online dating. Some estimates say120 thousand marriages a year result from matches made on the Internet. The dating industry has also been expanding in new ways. Many companies offer personalized services for finding the perfect mate. These companies are answering a large demand by single people. They are willing to invest their time and money to find love with carefully planned methods, instead of leaving love to chance. AskRomeo is a company in Virginia. It provides single people with advice on how to meet a person for the first time. Also in Virginia, the company True Life Partners provides a more costly and detailed dating service. The company hires a team of professional persons who help couples meet. But this level of service comes at a high price. Men pay thousands of dollars for the service. But women get to take part at no cost. There are lots of other costs linked to dating. And we wonder how the economic recession has affected dating in the US.
Question: According to the passage, we can know _ .
Options: (A) most of the marriages result from the Internet. (B) the dating industry is popular now (C) women won't spend money when dating (D) single people like love at the first sight now
Example Output:
B