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: Probably many of you know the idiom "an eye for an eye and a tooth for a tooth". But do you believe a tooth for an eye? That's something a little bit different. This strange exchange is neither a form ofretribution nor an unexpected gift from the Tooth Fairy --- it's actually a very generous gift from a young Irishman, Robert McNichol, 23, to his formerly blind father, 57-year-old Bob McNichol. In 2005, Bob McNichol's sight was destroyed in an accident when his eyes weredoused(......)with liquidaluminum . Doctors predicted that he would never be able to see again. But McNichol never liked to take no for an answer: when he heard about a unique operation called Osteo-Odonto-Keratoprosthesis, he knew he had to _ , even though the success rate was a mere 65 percent. In the technique, the eyesocket is rebuilt and implanted with a human tooth and part of the jawbone, to provide support for an artificialcornea . Luckily for McNichol, Robert was willing to sacrifice one of his teeth to help his father regain his sight. The technique isn't simple: McNichol's first stint on the operating table lasted ten hours, with a five hour follow-up session at a later date. But thanks to his son's gift, he's already seeing astonishing results. "Now I have enough sight for me to get around and I can watch television. I have come out from complete darkness." he told his friends.
Question: Bob McNichol lost his sight _ .
Options: (A) after he had an operation on his eyes (B) because of an accident (C) because he met with a serious traffic accident (D) when he was 57 years old

Ex Output:
B

Ex Input:
Article: Water is of vital importance in a healthy diet and lifestyle. There are many health benefits of drinking water .It helps get _ out of our systems. It aids in the delivery of oxygen and nutrients .In fact, nearly every system in our bodies depends on water for proper functioning .But how can we tell whether the water we're drinking is healthy? As to tap water, it's relatively easy .If your water comes from a governmental source , the suppliers are required by law to provide annual water quality reports .If you have a well, you can have an authorized lab test your water .It may cost $100 or more, but it's a small price to pay for peace of mind . When it comes to bottled drinking water, it can be more difficult to know what you're getting .Start by checking the label or the bottle cap. Some may tell you that the water comes from a governmental source or "community water system", which means tap water .If the label doesn't give any information, you can call the bottler and ask .But don't be surprised if you get the runaround and are transferred to several different departments .Some states have a bottled water program that tracks bottled drinking water and can tell you the origin of the water as well as other information . Safe and healthy drinking water has become big business .Thousands of companies are competing for your hard earned cash , and some are not always honest about what their products offer .The initial investment in a home drinking water filtration system can seem expensive at first , but over time , it is usually less expensive than bottled drinking water .And with a water filter , you at least know where the water you drink comes from and how it is treated . Before going out and spending your hard earned money on bottled drinking water , it's a good idea to do some research .You're likely to find that a drinking water filtration system or purifier is a healthier choice and provides the best value as well .
Question: By using a water filter, people _
Options: (A) can drink water without fearing that the water isn't treated (B) will have to pay more money eventually than if they just drink bottled water (C) will know if the water company is honest or not (D) can check the quality of the water by themselves.

Ex Output:
A

Ex Input:
Article: There are many Spanish gossip magazines being published around the world. If your Spanish is good enough, these magazines will offer a lively look into the private moments of the beautiful, rich and famous, and provide entertainment and at the same time, help you practice your Spanish. DiezMinutos: The magazine is a classic Spanish gossip feast with daily news based on many stories of love, separation, divorce and death. The two main parts are headlined "love"and "partners".They also have an online version of the magazine for serious gossip addicts. Hola: It is Spain's top weekly magazine and the leader of the gossip world. It contains many pictures and a round-up of well-known and less well-known nobles and people in show business. Apart from edited highlights from the present and past issues, there is a report of the week and photo of the week. There is also a French version calledOhLa! RevistaCUORE: As the third best-selling gossip magazine in Spain, it is mainly aimed at younger teenage readers who look not only for current celebrity gossip, but also for fashion and TV news. It uses a lot of oralterms. RevistaSEMANA: It is a Spanish magazine covering the latest news on the famous in Spain and Hollywood. It also offers its readers information on fashion, beauty, cooking and travel. RevistaLECTURAS: Practical, friendly and informal, this magazine is one of the most widely-read gossip magazines on the Spanish market today. Marujeo.com: It is a blog serving up a daily diet of national gossip news on Spanish and international celebrities and the celebrity world from a particular point of view. RevistaCARAS: It is a magazine published in various countries of Latin America. It is also exported to certain parts of the United States, bringing together strange and wonderful news from around the world and the famous Latin community.
Question: How many of the magazines mentioned in the text can be read on the Internet?
Options: (A) One. (B) Two. (C) Three. (D) Four.

Ex Output:
A