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: Most middle school students find it boring to learn math. But students in Yet Sen Middle School in New York, US, don't think so. Why? Because they are in the school of One Program, which asks students to work on their own or in small groups on computers to have math lessons. "The program gives the students a new learning style. No traditional classroom can compare with it. We give each lesson according to the students' interest and their strong and weak points, "said Joel. Klein, the school's headteacher, "We're looking for a new way that interests students. " Students enjoy these math lessons, especially lessons with video games. They must find out the answers to math problems to get through the game. One such game is Dimension M. As students move through mazes with their keyboards, some questions come up. Caleb Deng had to answer the question: What is 5+(6x3)? He _ on paper quickly because there was just a minute left to play. "I was right, "said Deng, 14, as he ended the game with a high score . "This really makes math lessons more exciting, since we are fighting to learn better. "
Question: Students in Yet Sen Middle School like math because _ .
Options: (A) they work in large groups (B) they can work on computer (C) the teachers are interesting (D) math questions are easy there

Ex Output:
B

Ex Input:
Article: Most students hate their endless homework. The students from Class 2, Senior 2 of the High School Affiliated to Peking University certainly did so before they published their own collection of English novels at home. Their small book contains stories about a holy war, the happy life of a self-taught artist and the story of a laid-off worker who devoted his last breath to playing his beloved accordion . The book becomes an instant hit on campus. About 3,000 copies have been sold and the class is already working on the second volume. "We're up to our ears in homework. Exercises and exams make us out of breath. But to do something creative and full of imagination is such a great achievement," said Yu Xiaoxiao, 16. "I took the writing as an ordinary homework at the beginning, but after I finished the first part of my story, I could not help but let it flow," said Wang An, who wrote "Accordion". Inspired by "Lord of the Rings", Jiang Lu wrote his story about magic wins between angels from the light and the dark side. "The main message of the story was to look at the balance of the world. Both dark and light angels fight with love as their weapons. I want to tell people that selfish love might bring hate," Jiang said. "I was shocked by their work and felt so proud to be the editor of my students' book," said Nathaniel Timmermann, the oral English teacher at the school. Liu Xiuqin, an English teacher, started the project by asking students to write whatever was in their mind every week. "They have performed beyond expectation," Liu said. "They wrote interesting stories and their English has improved after they started to express their real minds." "We never imagined that our homework would be so popular and profitable . We sell the novels at five yuan, but many teachers pay more to encourage us," said Yuan Mengyao.
Question: After Wang An finished the first part of his story, he _ .
Options: (A) couldn't go on (B) had to put aside (C) just wanted to express it freely (D) lost it

Ex Output:
C

Ex Input:
Article: Tom Hanks has one of the most successful and extensive careers in Hollywood. He has acted in television shows and movies, and done voice work for animated films. He's also a movie director, producer and writer. He won the Academy Award for best actor in back to back years. Spencer Tracy is the only other actor to have done that. Tom Hanks was born in California in1956. His father and mother ended their marriage when he was five. Tom and his two older siblings lived with their father. The youngest child stayed with his mother. He once told a reporter that he had had three mothers, four fathers, five schools and ten houses while growing up. The movie star said he thinks the many changes helped him develop a sense of independence. Tom Hanks started acting in high school. He took drama classes in college but left before completing his studies. He said he could not get parts in college plays so he left for New York to follow his professional dream. His first major parts were on television. He won a lead role in the situation comedy Bosom Buddies in 1979. But he became a star with the movieSplash in 1984. More success came four years later with his starring part in the hit movieBig. He played a 13-year-old boy who wakes up one day in a grown man's body. Tom Hanks mainly worked in comedies in the early years of his career. His starring part in the 1993 movie Philadelphia changed his image. He was honored with his first Best Actor Oscar for his work inPhiladelphia. His interest in the experiences of World War Two soldiers led him to his involvement in the TV series Band of Brothers. He was also named an honorary member of the US Army Rangers as a result. He also produced the 13-part series From the Earth to the Moonbecause of his support for human space travel. He is a member of the National Space Society.
Question: How many children did Tom Hanks' parents have when their marriage ended?
Options: (A) Three. (B) Four. (C) Five. (D) Six.

Ex Output:
B