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: Some years ago industries had more freedom than they have now, and they did not need to be as careful as they must today. They did not need to worry a lot about the safety of the new products that they developed. They did not have to pay much attention to the health and safety of the people who worked for them. Often new products were dangerous for the people who used them; often conditions in the work place had very bad effects on the health of the workers. Of course sometimes there were real disasters which attracted the attention of governments and which showed the need for changes. Also scientists who were doing research into the health of workers sometimes produced information which governments could not ignore. At such times, they inquire into the causes of the disasters or the problems. New safety rules were often introduced as a result of these inquiries; however. the new rules came too late to protect the people who died or who became seriously ill. Today many governments have special departments which protect customers and workers.In the U.S, for example, there is a department which tests new airplanes and gives warnings about possible problems. It also makes the rules that aircraft producers must follow. Another department controls the foods and drugs that companies sell. A third department looks at the places where people work. and then reports any companies that are breaking the laws which protect the health and safety of workers. Of course, new government departments and new laws cannot prevent every accident or illness. but they are having some good results. Our work places are safer and cleaner than before. The planes and cars which we use for travel are better. Producers are thinking more about the safety and health of the people who buy and use their products.
Question: The main topic of the passage is _ .
Options: (A) conditions in the work place (B) the freedom of industries in the past (C) changes in industrial production (D) the safety and health of workers and customers
Example Output: D

Example Input: Article: Computers are very important to modern life.Many people think that in the future computers will be used in lots of everyday life.It is thought that we won't have to go shopping because we will be able to get most things which are sold in shops on the Internet.There will be no more books because we will be able to get all texts from computers.The Internet will be used to play games, see films and buy food.Most telephone calls will be made by computers, too. Some people are glad about those new ways of shopping and communicating .Others do not think that computers will replace our old ways. Some people think that one day we will not read books made of paper. Instead, we will buy and read books using computers, which will keep many different books in them at the same time.We won't need to turn lots of pages and paper will be saved.Computerized books will be used more and more. While many people say it is a pleasure to go into shops and look at things you want to buy.It is also unlikely that many people will want to read large texts on our computers. Because paper books will perhaps be more friendly.Maybe computers won't change these two habits.
Question: Which is the main idea of this passage?
Options: (A) People like going shopping (B) Reading books is important (C) Computers are important (D) Computer can be used to play games
Example Output: C

Example Input: Article: Gu Changwei was the first Chinese cinematographer to be nominated for an Oscar, he is regarded by Zhang Yimou as the best cinematographer in China. Gu was behind the camera for many of Zhang Yimou's famous films including the one that rocketed Zhang to fame: "Red Sorghum ". And now this master of the visual has taken on his first directing role with the film "Peacock". So Gu Changwei has come out from behind the camera into the spotlight . Gu Changwei is very serious about his directing "Peacock". To get the authentic atmosphere, Gu took his film crew to the city of Anyang in central China's Henan province where the story takes place, to shoot the film. He chose all new actors because he didn't want "star" appeal to weaken the power of the story, and he also had his actors trained in the local dialect. For this film Gu has been able to get out from behind the camera to manage every aspect of the film, and to realize his own ideals in movie-making. "Peacock" is about the life of an average family in a small town in Henan province in the late 70s and early 80s. Gu chose this story for his first movie because he grew up during this same period and it struck a chord with him. "Peacock" wrapped up production in June, 2004. It's aimed at the foreign film market and will be entered in February's Berlin Film Festival, and released in China at the same time. But at the end of last October, Gu took "Peacock" to his Alma Mater, the Beijing Film Academy, one of the most famous film colleges in China, to hold a preview. The film was warmly received by both teachers and students.
Question: Gu didn't employ "stars" in his film because _ .
Options: (A) stars usually stick to their own acting styles (B) the stars may not be able to speak the local dialect (C) the stars may share the audience's attention with the story (D) it was not easy for him, a fresh hand, to invite stars to join him
Example Output:
C