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 longest bull run in a century of art-market history ended on a dramatic note with a sale of 56 works by Damien Hirst, Beautiful Inside My Head Forever, at Sotheby's in London on September 15th 2008. All but two pieces sold, fetching more than PS70m, a record for a sale by a single artist. It was a last victory. As the auctioneer called out bids, in New York one of the oldest banks on Wall Street, Lehman Brothers, filed for bankruptcy, starting the most severe financial crisis since the 1920s. The world art market had already been losing momentum for a while after rising confusingly since 2003. At its peak in 2007 it was worth some $65 billion, thinks Clare McAndrew, founder of Arts Economics, a research firm -- double the figure five years earlier. Since then it may have come down to $50 billion. But the market generates interest far beyond its size because it brings together great wealth, enormous egos , greed, passion and controversy in a way matched by few other industries. In the weeks and months that followed Mr. Hirst's sale, spending of any sort became deeply unfashionable. In the art world that meant collectors stayed away from galleries and salerooms. Sales of contemporary art fell by two-thirds, and in the most overheated sector, they were down by nearly 90% in the year to November 2008. Within weeks the world's two biggest auction houses, Sotheby's and Christie's, had to pay out nearly $200m in guarantees to clients who had placed works for sale with them. The current downturn in the art market is the worst since the Japanese stopped buying Impressionists at the end of 1989. This time experts suppose that prices are about 40% down on their peak on average, though some have been far more volatile . But Edward Dolman, Christie's chief executive, says, "I'm pretty confident we're at the bottom." What makes this fall different from the last, he says, is that there are still buyers in the market, while in the early 1990s, when interest rates were high, there was no demand even though many collectors wanted to sell. Christie's earnings in the first half of 2009 were still higher than in the first half of 2006. Almost everyone who was interviewed for this special report said that the biggest problem at the moment is not a lack of demand but a lack of good work to sell. The three Ds -- death, debt and divorce -- still deliver works of art to the market. But anyone who does not have to sell is keeping away, waiting for confidence to return.
Question: Which of the following statements is true?
Options: (A) .Sales of contemporary art fell dramatically from 2003 to 2008. (B) The art market didn't match many other industries in momentum. (C) The market generally went downward in the same way. (D) Some art dealers were awaiting better chances to come.

Ex Output:
D

Ex Input:
Article: Thanksgiving is a time to give thanks for family, health, and life in general. However, Black Friday has turned it into a business. Traditionally, the true value of Thanksgiving lies at home not the shopping centers. However, Black Friday has nowadays allowed society to ignore _ as individuals long for something that they do not need or even truly want. Shopping on Black Friday becomes a sign of a shift into a culture that values material wealth over spending time with loved ones. People are willing to force their way through the crowds in their desperate search for marked-down sweaters and necklaces. In recent years, Thanksgiving has become a pre-Black Friday holiday for many families. They are devoted to mapping out shopping routes and making organized schedules for which stores to hit first. By drawing individuals out to shopping centers with "matchless savings", businesses encourage this behavior of ignoring Thanksgiving. Many families take their home-cooked meals while camping out at the door of shopping centers. With each new year, Thanksgiving is becoming victim to over-commercialization--switching from a meaningful time of thanks and family to a day dedicated to products and profit. Black Friday has shown that with current common standards, people cannot even set aside a single day to appreciate what they already have without immediately buying more. Families have lost sight of what is truly important in life, and have found reasons in debating between a low cost HD television and an appreciation for what they already have. Remember, Thanksgiving should be a day in which people are grateful for all that they have.
Question: In recent years, what will many families do when thanksgiving comes?
Options: (A) Make full preparations for the Black Friday shopping. (B) Visit some newly-opened shopping centers in advance. (C) Find it difficult to choose a store for their first visit. (D) Go camping at the gate of shopping center for a good deal.

Ex Output:
A

Ex Input:
Article: A trip across the Pacific will guarantee you a different experience with a tipping culture you've never come across in China. In the US, giving a little extra money to service workers on top of your bill is a common practice. Though US national law requires that businesses pay workers at least $7.25 (45 yuan) per hour, employees receiving tips--often waiters and waitresses--are the exceptions. They usually only receive at least $2.13 an hour, and tips make up the difference. As theWall Street Journalput it, "The American system of tipping holds the promise of great rewards for waiting staff." So how should you tip if you are in the US. Normally you pay tips as a percentage of the bill. Offering an extra 15 percent of the bill to the waiter or waitress in a restaurant and to the delivery man or woman is customary and expected. You can offer more for great service and less for poor service. Yet there is an exception. For take-out food, you don't have to provide tips, though some people say that filling an order still requires work and time that deserve a little extra--but maybe a little less. Tips are not expected at fast food restaurants, cafes or ice cream shops either, though a tip jar might be right by the cash register . Don't feel _ to throw some money in, but also remember that it doesn't hurt. Those workers do not rely on tips. Other service workers also receive tips. For taxi drivers, 15 percent is the norm , more if they help with your bags. Hairdressers often receive about 15 percent of the bill. The same goes for spa therapists and tour guides. Today, you can even pay tips on a credit card. When receiving a copy of the bill to sign, you are free to fill in how much you'd like to tip. Though thinking about when to tip and how much you should tip causes a big headache for many Chinese people, it's important to bear in mind that as long as you show respect and use your reasoning, things will be just fine.
Question: What is the article mainly about?
Options: (A) How tipping culture started in the US. (B) How to giving tips properly in the US. (C) New ways to give tips in the US. (D) The different attitudes that Chinese people and Americans have toward tipping.

Ex Output:
B