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.

Input: Consider Input: Question: Did the highest scoring fighter ace have any siblings? Passage:After a short rest, the 90th continued across the Moselle River to take Mainz, 22 March, and crossed the rivers Rhine, the Main, and the Werra in rapid succession. Pursuit continued to the Czech border, 18 April 1945, and into the Sudetes mountain range. The division was en route to Prague when they came upon the remaining 1500 emaciated prisoners left behind by the SS at Flossenbürg concentration camp. Today, a memorial wall at the former camp honors the 90th as the liberators of Flossenbürg concentration camp. A week later, word came that the war in Europe ended on 8 May 1945. On that same day, Erich Hartmann, the highest-scoring fighter ace in history, along with a squadron of the elite Jagdgeschwader 52 fighter wing (the highest-scoring fighter wing in history), surrendered to the 90th.
 Links: a. Main (river) b. Jagdgeschwader 52 c. Prague d. Erich Hartmann

Output: d


Input: Consider Input: Question: Which series hosted by the track was founded the earliest?  Passage:Talladega Superspeedway, originally known as Alabama International Motor Superspeedway (AIMS), is a motorsports complex located north of Talladega, Alabama. It is located on the former Anniston Air Force Base in the small city of Lincoln. The track is a tri-oval and was constructed in the 1960s by the International Speedway Corporation, a business controlled by the France Family. Talladega is most known for its steep banking and the unique location of the start/finish line that's located just past the exit to pit road. The track currently hosts the NASCAR series such as the Sprint Cup Series, Xfinity Series and the Camping World Truck Series. Talladega is the longest NASCAR oval with a length of tri-oval like the Daytona International Speedway, which also is a tri-oval.
 Links: a. NASCAR b. NASCAR Gander RV & Outdoors Truck Series c. Talladega, Alabama d. Daytona International Speedway

Output: b


Input: Consider Input: Question: How old was the race track where Lyons tested in an ARCA Racing Series car? Passage:Lyons started his racing career at the age of six, racing dirt bikes. Lyons raced dirt bikes for over a decade, winning two Florida championships. After injuring both legs in a crash when he was fifteen, Lyons quit bike racing at eighteen. He then moved to Legends car racing after seeing former motocross racer Ricky Carmichael transition. After Legends cars, Lyons competed in the Pro All-Stars Series in 2014. In December 2014, Lyons tested at Daytona International Speedway in an ARCA Racing Series car that was prepared by both Rick Ware Racing and MacDonald Motorsports. In early 2015, Lyons joined Chad Finley and his team as a development driver to compete in the 2015 CARS Tour; Lyons wound up only running three of the races. Lyons made a return to the CARS Tour in 2017 and also competed in the Short Track Nationals at Bristol Motor Speedway.
 Links: a. Daytona International Speedway b. Florida c. Florida d. Bristol Motor Speedway


Output: a