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 most important holiday in spring, especially for Christians , is Easter. This Christian holiday is not on the same date every year, but it's always on a Sunday. It can be any Sunday between March 22 and April 25. Many people celebrate Easter by buying new clothes. Children celebrate by hunting for color1ed eggs that their parents have hidden around the house. People also give Easter baskets filled with candy and other goodies to one another to celebrate the day. But the holiday is more than new clothes and good things to eat. On Easter, many people go to church to celebrate Jesus' resurrection from the dead. Most people color1 them. Some people hide them. Others just eat them. But no matter what one does with Easter eggs, they are an important Easter tradition throughout the Western world. People from many different cultures celebrate Easter. In both America and Belgium, children look for Easter eggs hidden on lawns and in bushes. In America, children believe the eggs are hidden by the Easter bunny . But in Belgium, the hidden eggs are supposed to have fallen from church bells. In Bulgaria, red Easter eggs are lucky in churches; Bulgarian families also hit these Easter eggs together to see whose is the strongest. The winner looks forward to good fortune that year. Still dozens of other Easter traditions exist. In parts of Austria, for example, children sing from door to door and are rewarded with color1ful eggs.
Question: Easter comes _ .
Options: (A) on the same date every year (B) on Sunday on March 22 (C) on Sunday on April 25 (D) on a Sunday between March 22 and April 25

Ex Output:
D

Ex Input:
Article: If you were walking around a supermarket and saw a woman with a shaved head, a ring through her nose, a tattoo design on her arm and she has a small child in her shopping _ , what would your opinion be? Do you think this kind of body decoration is attractive or ugly? Different people have different ideas. The following are some examples of body decoration from around the world. In many parts of Africa, it is thought that an attractive girl should have really shinny skin. On Bali, a little island in Indonesia, they believe that a beautiful woman or handsome man must have perfectly straight, flat teeth. The Balinese believe that teeth with pointed edges make you look like an ugly wild animal. So when a girl or boy becomes a teenager, he or she is taken to a special person in their village who will file off teeth points to make them smooth and flat. There is no anesthetic and this tooth filing is really painful. It is a kind of test. If you can stand it without screaming or crying too much, then you are thought ready to become an adult. In Myanmar, there is a small group of people who are called the "Papaung". They believe that a woman can only be really beautiful if she has a long neck. I mean a VERY long neck. Now you might think that you are either born with a long or short neck and that there's nothing whatever you can do about it. But you would be wrong! At around the age of 5, a Papaung girl has heavy metal rings fitted around her neck, tightly between the chin and shoulders. Each year more rings are added and very, very slowly their weight pushes the shoulders down, in this way making the neck look longer. A Papaung woman will wear her neck rings all her life, never once taking them off. So now I'm sure you will all agree that different people have different ideas about what is beautiful.
Question: On Bali, it is believed that _ .
Options: (A) a person with straight, flat teeth looks ugly (B) a person with sharp teeth looks ugly (C) a teenager's teeth points must be filed off with anesthetic (D) no one will scream or cry when having his teeth points filed off

Ex Output:
B

Ex Input:
Article: The goal of earthquake prediction is to give early enough warning. The U.S. Geological Survey conducts and supports research on the likelihood of future earthquakes. Scientists estimate earthquake probabilities in two ways: by studying the history of large earthquakes in a special area and the rate at which strain accumulates in the rock. Scientists study the past frequency of large earthquakes in order to determine the future likelihood of similar large shocks. For example scientists researched the large earthquakes in the San Francisco Bay region during the 75 years between 1836 and 1911. For the next 68 years, no earthquakes of magnitude 6 or large occurred in the region. Beginning with a magnitude 6 shock in 1979, the earthquakes in the region increased dramatically; between 1979 and 1989, there were four magnitude 6 or greater earthquakes, including a magnitude 7.1 earthquake. So scientists estimated that the probability of a magnitude 6.8 or larger earthquake occurring during the next 30 years in the region is about 67 percent. Another way to predict earthquakes is to study how fast strain accumulates. When plate movements build the strain in rocks to a critical level, like pulling a rubber band too tight, the rocks will suddenly break and slip to a new position. Scientists measure how much strain accumulates along a fault each year, how much time has passed since the last earthquake, and how much strain was released in the last earthquake. This information is used to calculate the time required for the accumulating strain to build to the level that results in an earthquake. This simple model is so complicated that such detailed information about faults is rare. In the United States, only the San Andreas Fault System has adequate records for using this prediction method. Scientific understanding of earthquakes is of vital importance to the Nation. As the population increases, expanding urban development and construction encroach upon areas susceptible to earthquakes. With a greater understanding of the causes and effects of earthquakes, we may be able to reduce damage and loss of life from this destruction.
Question: What does the passage mainly talk about?
Options: (A) What an earthquake is like. (B) How to predict earthquakes. (C) Where earthquakes often happen. (D) When a fault is formed.

Ex Output:
B