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: The Great Barn Adventure One morning when I was 11, I explored the town's abandoned round grain barn . I found a chained sliding door that was wide enough for me to pass through. Inside, there was a heavy smell of dead mice in the dark. After my eyes adjusted, I noticed a shaft that rose all the way to the top of the barn. On one side was a one-man elevator with a long rope and roller. I stepped onto the platform and gave the rope a drag and the elevator began sliding up the shaft, but stopped halfway. After a brief panic attack, I noticed holes in the wall at regular intervals, forming a ladder. For reasons known only to an 11-year-old, I decided it would be better to go up than down. So, with shaking hands, I began climbing the wall. After what seemed like forever, I reached the top of the shaft. I stood up, dusted myself off and found absolutely nothing of interest. It was just an empty room with a ladder leading up to the roof. I climbed all the way up here for this? Then I noticed a fire extinguisher ,which I'd always wanted to shoot off. So this was the chance of a lifetime. I tried it, and, much to my surprise, the thing worked! It shot out a thick cloud of powder that instantly filled the room. I couldn't breathe. I was going to choke to death, and they'd probably never even find my body. Luckily, I remembered the ladder to the roof. I climbed up, popped the straw roof and saw a bright blue sky. I suddenly realized the dust and powder pouring out of the top could draw attention. So when the dust had settled, I climbed down and slipped out of the chained door. I'm not sure if I was more excited about being alive or about not being caught, but I ran all the way back home.
Question: When the author got inside the barn, he _ .
Options: (A) noticed a man on the elevator (B) opened the chained sliding door (C) saw many dead mice in the dark (D) found a shaft leading to the top

Ex Output:
D

Ex Input:
Article: Most cultures have a feast or festival of light. Each culture celebrates this festival in a different way. The Jewish Festival of Light is called Hanukkah. It usually takes place in December. The story of why Hanukkah is celebrated is very old. It is told that a long time ago, Jewish people called the Macabees were at war with a country called Syria. On the day that the Macabees won the war, they cleaned up their holy place, which is called a temple, because the Syrian people had been living there. They wanted to light their holy lamps to say thank you for the end of the year, but found only a very small amount of oil left over to do that. The Macabees lit the lamps anyway, thinking that they would soon go out. The lamps kept burning for eight days! The Jewish people celebrate Hanukkah every year by lighting a candlestick that has eight candleholders. Every night a new candle is lit so that on the eighth night, all eight candles stand together. Presents are given at this time and money is given to the poor. The Christmas story is not quite as old as the Hanukkah story, but it is also very old. Christmas is the time when Christians around the world celebrate the birth of Jesus Christ. It is believed that Christ was born in a stable. On the night of his birth, angels, shepherds and three wise men visited him. The wise men brought gifts with them. This is a happy and busy time of the year. Homes are decorated with Christmas trees and decorations. It is a time for being with the family. Families travel long distances to gather at Christmas. Lots of lights are put up everywhere. This is to show that Jesus is the"Light of the world"who came to bring peace to all people. Lanterns are another form of light. In China, the Lantern Festival goes back to the Han Dynasty. One emperor heard that Buddhist monks would light lanterns to _ Buddha on the 15th day of the 1st lunar month;so he also ordered to light lanterns in the imperial palace and temples to show respect to Buddha on the day. Later, the rite developed into a grand festival among common people. During the festival, parks become a sea of lanterns. Sometimes streets are blocked off and lanterns are put down on each side to make a hallway of lanterns. People also hang lanterns in their gardens, outside their houses or on boats. It is believed that the lanterns will guide visitors and the spirits of ancestors to the celebrations. The Lantern Festival is a time for families to reunite.
Question: What is the theme shared by all the three festivals?
Options: (A) The decoration of the world. (B) The wish for peace and happiness in the world. (C) Celebrating the end of the year. (D) Inviting the spirits of the ancestors to the celebration.

Ex Output:
B

Ex Input:
Article: Nelson Mandela was a figure of international fame, and many details of his life and career were public knowledge. But here are four things you may not have known about the late South African leader. 1. He was a boxing fan. In his youth, Nelson Mandela enjoyed boxing and long-distance running. Even during the 27 years he spent in prison, he would exercise every morning. "I did not enjoy the violence of boxing so much as the science of it. I was curious by how one moved one's body to protect oneself, how one used a strategy both to attack and retreat, how one paced oneself over a match," he wrote in his autobiography Long Walk to Freedom. 2. His original name was not Nelson. Rolihlahla Mandela was nine years old when a teacher at the primary Methodist school where he was studying in Qunu, South Africa, gave him an English name "Nelson" in accordance with the custom to give all school children Christian names. 3. He forgot his glasses when he was released from prison. Mr. Mandela's release on 11 February 1990 followed years of political pressure against apartheid . Mr. Mandela's reading glasses stayed behind in prison Mr. Mandela and his then-wife Winnie were taken to the centre of Cape Town to address a huge and exciting crowd. But when he pulled out the text of his speech, he realized he had forgotten his glasses and had to borrow Winnie's. 4. He had his own law firm, but it took him years to get a law degree. Mr. Mandela studied law on and off for 50 years from 1939, failing about half the courses he took. A two-year diploma in law on top of his university degree allowed him to practice, and in August 1952, he and Oliver Tambo set up South Africa's first black law firm, Mandela and Tambo, in Johannesburg. He kept on studying hard to finally secure a law degree while in prison in 1989.
Question: What is the main idea of the passage?
Options: (A) Nelson Mandela's life in the prison. (B) The achievements of Nelson Mandela. (C) Nelson Mandela's hobbies and career. (D) Unknown things about Nelson Mandela.

Ex Output:
D