In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Example Input: Question: What are earthwork mounds made of? Passage:Indigenous peoples inhabited Missouri for thousands of years before European exploration and settlement. Archaeological excavations along the rivers have shown continuous habitation for more than 7,000 years. Beginning before 1000 CE, there arose the complex Mississippian culture, whose people created regional political centers at present-day St. Louis and across the Mississippi River at Cahokia, near present-day Collinsville, Illinois. Their large cities included thousands of individual residences, but they are known for their surviving massive earthwork mounds, built for religious, political and social reasons, in platform, ridgetop and conical shapes. Cahokia was the center of a regional trading network that reached from the Great Lakes to the Gulf of Mexico. The civilization declined by 1400 CE, and most descendants left the area long before the arrival of Europeans. St. Louis was at one time known as Mound City by the European Americans, because of the numerous surviving prehistoric mounds, since lost to urban development. The Mississippian culture left mounds throughout the middle Mississippi and Ohio river valleys, extending into the southeast as well as the upper river.
 Links: a. Archaeology b. Collinsville, Illinois c. Earthworks (archaeology) d. Collinsville, Illinois
Example Output: c

Example Input: Question: In which country is the seaport city of Porto located where the wine received its name "port"? Passage:Port is produced from grapes grown and processed in the demarcated Douro region. The wine produced is then fortified by the addition of a neutral grape spirit known as aguardente to stop the fermentation, leaving residual sugar in the wine, and to boost the alcohol content. The fortification spirit is sometimes referred to as brandy but it bears little resemblance to commercial brandies. The wine is then stored and aged, often in barrels stored in a Lodge (meaning "cellar") as is the case in Vila Nova de Gaia, before being bottled. The wine received its name, "port", in the later half of the 17th century from the seaport city of Porto at the mouth of the Douro River, where much of the product was brought to market or for export to other countries in Europe. The Douro valley where port wine is produced was defined and established as a protected region, and the name Douro thus an official appellation, in 1756, making it the third oldest, after Chianti (1716) and Tokaj (1730).
 Links: a. Barrel b. Tokaji c. Vila Nova de Gaia d. Porto
Example Output: d

Example Input: Question: What month was Resnick's younger niece born in? Passage:Resnick joined the series after appearing previously is season two as a friend of Kyle Richards. Richards and Resnick have worked together and known each other for a long time with Resnick helping design Kyle and her nieces, Paris and Nicky Hilton's homes. Prior to meeting Kyle, Resnick was born in North Carolina, where she began her career as a model. Resnick moved to San Francisco, where she opened and ran her own modelling agency. In Los Angeles, Resnick had gained a lot of notoriety during the murder trial of her friend Nicole Brown Simpson who allegedly had been murdered by her ex-husband O. J. Simpson. During the trial Resnick had a memoir published, Nicole Brown Simpson: The Private Diary of a Life Interrupted. With her new found fame, she then later went on to pose for Playboy. In Later years, Resnick had always been inspired by Europe and went on to get married in London and give birth to her daughter, Sophia. Resnick soon owned many homes across Europe and the United States and moved back to the U.S with a new sense of creativity and eye for design. Resnick stuck with her passion for design and has since designed many projects, including Fendi Casa LA, Color at Caesars Palace, Amp Salon at The Palms Hotel, and Dash Retail Boutique. Resnick has also designed homes for many celebrities, such as Avril Lavigne, Kevin Connolly, Vanessa and Nick Lachey, and Ike Bakrie’s international residence in Indonesia. 
 Links: a. Paris Hilton b. Kevin Connolly (actor) c. Paris Hilton d. San Francisco
Example Output:
a

