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: Let's pretend we're sailing down the Rhine River on a pleasure boat. The Rhine is one of the main waterways of Germany, and the river traffic is heavy. It's interesting to watch the many boats going up and down the river. But the river traffic is not nearly so interesting as the beautiful scenery along the banks and hillsides. The boat is passing many old castles. We can see people working in the vineyards on the hillsides. There are vineyards as far as the eye can see. Wine from the Rhine Valley is famous all over the world. Suddenly our boat slows down and begins to turn a little. We are coming to a sharp bend in the river. On our right we can see a rocky cliff over 400 feet high. At first it looks quite ordinary, but there is nothing ordinary about it. There are many stories, poems, and songs about the cliff. We are looking at the Lorelei. Then someone on the boat begins to sing in German, the song of the Lorelei. It is a song about a beautiful siren who has lured many sailors to their deaths. The siren is supposed to sit on the rock combing her long golden hair and singing. The sailors who hear her forget to steer , and the current of river hurls their boats on the rocks and dashes them to pieces. Soon other people on the boat begin to sing. The beautiful song adds to special magic to the moment, and you begin to realize why so many people have made this trip down the Rhine to see the rock of the Lorelei.
Question: The most interesting thing to those who are sailing down the Rhine River on a pleasure boat is _ .
Options: (A) to watch many boats going up and down the river (B) to see the beautiful scene along the banks and hillsides (C) to hear a song about beautiful siren (D) to see a beautiful siren combing her golden hair

Ex Output:
B

Ex Input:
Article: Heavy rains have caused disasters across China this summer, bringing the worst landslides in decades. The most deadly disaster happened on August 8 when a big landslide hit Zhouqu County in Gansu province, killing at least 1,407 people. On August 18, landslides hit Gongshan, a town in northwestern Yunnan. At least 38 people were killed and 54 are missing. Heavy rains also caused landslides in several counties in Sichuan province. People were forced to evacuate to safe places. Landslides and devastation Landslides take place when dirt and rocks slide down a slope together. Sometimes these landslides are small, and hardly noticeable. Other times however, they can be massive, involving the entire side of a mountain. Landslides can be caused by a number of different things. Often rain, which adds weight to the side of a slope, can cause one. Other times they might be caused by erosion .When a stream slowly removes the base of a slope, it weakens the entire side of the mountain. As a slide moves down a mountain slope, it can pick up great speed and energy. Some slides travel at a speed of 300km an hour. The resulting winds can be so powerful that they are known to strip the leaves off surrounding trees. Earthquakes and landslides Some experts think the landslides in Sichuan were related to the magnitude-8.0 Wenchuan earthquake on May 12, 2008. The quake has caused a change in the structure of the Earth's surface, making it more likely that land will slide in the rain, according to geologist Xu Qiang of the Chengdu University of Technology. Landslides pose threats to 140 cities and towns in the country, one quarter of which are in Sichuan, said Wei Fangqiang, a researcher with the Chinese Academy of Sciences. Landslide prevention If you want to avoid being a landslide victim, the easiest thing to do is avoid living on slopes or close to mountains. If you live in a landslide-threatened area, try not to water the slopes if possible. If there are large rocks on the slopes above your house, remove them so that they don't cause damage if they fall. It might also be helpful to plant trees on the slopes. Over time, the tree roots may make the soil firmer.
Question: The landslides around China are mentioned at the beginning of the article to _ .
Options: (A) warn travelers to keep away from those places (B) show that the environment in China is getting worse (C) introduce the topic of landslides (D) express concern for those affected by landslides

Ex Output:
C

Ex Input:
Article: Planning for the weather No matter what time of year you vacation in San Diego, be sure to bring a light jacket or sweater and bring shorts. During our summer months, we have warm days but cool evenings, especially if you are near the ocean. Those cool evenings can feel cold and fresh if you are visiting from someplace that is typically hot and damp all summer. And during our winter months, we can have days that reach 80 degrees Fahrenheit (27 degrees Celsius). In fact, our winter months are the sunniest months of the year along the San Diego coast. How to get around San Diego Deciding whether you need to rent a car for your visit to San Diego? If you are planning to visit attractions in and around downtown San Diego, including SeaWorld, San Diego Zoo, Balboa Park, Old Town, Coronado, and the Gaslamp Quarter, all of these attractions can be readily accessed by public transportation assuming the hotel or place you are staying in is close to a bus or trolley stop. Tour guests comment on how easy it is to use our transportation system, how clean it is, and the low cost for a one-day or multi-day pass that works on both buses and trolleys. However, if you are going to visit attractions further away from downtown San Diego such as the Safari Park or Legoland or if you want to visit our local mountains or desert, we recommend a car rental. How to make time for all the things to do Our final tip for now is to plan ahead. Unlike most cities where there may be a few concentrated tourist areas and it's easy to find things as you go, San Diego offers hundreds of attractions and guests tell us they are overwhelmed and certainly didn't plan enough time once they find how much there is to do in San Diego. Many guests visit San Diego as part of an extended trip that includes San Francisco and Los Angeles. They often plan fewer days in San Diego because they assume it is the smallest city with the least to offer only to say they wished they had planned more days in San Diego because it offers more things to do in a much more relaxing environment. By planning ahead you can also get discounts for various attractions. For example you can save a lot of money at SeaWorld if you buy your tickets in advance online, at a visitor center or through your hotel. Another reason to plan ahead is that some attractions close early or get sold out since San Diego is a big destination for major conventions and big companies bringing in employees from around the world for special events in beautiful, sunny San Diego.
Question: Which of the following is the best title of the passage?
Options: (A) Brief Introduction to San Diego (B) Tips for Visiting San Diego (C) Attractions in and around San Diego (D) Reasons for Visiting San Diego

Ex Output:
B