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: What age bracket plays for the Real Madrid's youth system? Passage:Casillas began his career in Real Madrid's youth system, known as La Fábrica, during the 1990–91 season. On 27 November 1997, at age 16 and still a junior, he was first called up to the senior team squad to face Rosenborg in the UEFA Champions League, although he remained on the bench throughout. After spending a season with the C-team in the fourth tier, during which they won their regional group, he came into contention as the club's first-choice between the posts. In starting the 1999–2000 UEFA Champions League group stage fixture against Olympiakos on 15 September 1999, he became the youngest goalkeeper ever to feature in the competition at the time, aged 18 years and 177 days; a record which was only broken in October 2017 by Mile Svilar. Three days earlier, Casillas had made his La Liga debut in a 2–2 draw against Athletic Bilbao at San Mamés Stadium. In May 2000, he became the youngest ever goalkeeper to play in and win a Champions League final when Real Madrid defeated Valencia 3–0, just four days after his 19th birthday.
 Links: a. Olympiacos F.C. b. Real Madrid CF (youth) c. La Fábrica d. Real Madrid CF (youth)

Output: b


Input: Consider Input: Question: Which team won the 1988 World Series? Passage:He made his Major League debut on May 24, 1994. In the game, Hamilton allowed three runs and five hits in six innings but ended up winning the game 6–3 after Phil Clark hit a three–run home run. Overall, Hamilton went 9–6 with a 2.69 ERA in 108 innings pitched. He was fifth in the Major League Baseball Rookie of the Year Award voting for the National League. In 1995, Hamilton went 6–9 with a 3.08 ERA in 30 starts and 204 innings pitched. Hamilton gave up 189 hits and 70 earned runs (89 unearned). Hamilton walked 56 batters and struck out 123. At age 25 in 1996, Hamilton put up a career high in wins (15) and his second most innings pitched (211). Hamilton accrued a 4.17 ERA in 33 starts, along with 206 hits allowed and 98 earned runs. In his fourth year with San Diego in 1997, Hamilton started on Opening Day for the Padres. In the game, he pitched six innings and gave up four runs on eight hits. The Padres won the game over the New York Mets 12–6. Hamilton compiled a 12–7 record with a 4.25 ERA for the season and gave up 69 walks and struck out 124. Hamilton suffered a shoulder injury that was described as an inflammation of the rotator cuff and bursa sac. This injury forced Hamilton onto the disabled list during the 1997 season. Hamilton called the injury "real scary", saying that he feared he may lose the ability to throw . During the 1998 off-season, San Diego acquired Kevin Brown through a trade with the Florida Marlins, giving San Diego three pitchers who could throw at and above, including Hamilton. With the Padres in 1998, Hamilton's last season in San Diego, he had a 13–13 record, 4.27 ERA in 34 starts and 217 innings pitched. He walked a career-high 106 batters and struck out 147. There was a rumored trade around the 1998 MLB trade deadline that would have sent Hamilton to the Detroit Tigers, but it never materialized. During the 1998 World Series, the Padres scheduled Hamilton to pitch game four but was passed over for game one starter Kevin Brown and instead entered game three to relieve starter Sterling Hitchcock. With San Diego, Hamilton went 55 and 44 with a 3.75 ERA in 934 innings pitched.
 Links: a. 1998 World Series b. Sterling Hitchcock c. Phil Clark (outfielder) d. Major League Baseball Rookie of the Year Award

Output: a


Input: Consider Input: Question: Which album that Richards was involved in made more money, the Bradley Barn Sessions or Burn Your Playhouse Down - The Unreleased Duets? Passage:In the 1990s and 2000s Richards continued to contribute to a wide range of musical projects as a guest artist. A few of the notable sessions he has done include guitar and vocals on Johnnie Johnson's 1991 release Johnnie B. Bad, which he also co-produced; and lead vocals and guitar on "Oh Lord, Don't Let Them Drop That Atomic Bomb on Me" on the 1992 Charles Mingus tribute album Weird Nightmare. He duetted with country legend George Jones on "Say It's Not You" on the Bradley Barn Sessions (1994); a second duet from the same sessions, "Burn Your Playhouse Down", appeared on Jones' 2008 release Burn Your Playhouse Down – The Unreleased Duets. He partnered with Levon Helm on "Deuce and a Quarter" for Scotty Moore's album All the King's Men (1997). His guitar and lead vocals are featured on the Hank Williams tribute album Timeless (2001) and on veteran blues guitarist Hubert Sumlin's album About Them Shoes (2005). Richards also added guitar and vocals to Toots & the Maytals' recording of "Careless Ethiopians" for their 2004 album True Love, which won the Grammy Award for Best Reggae Album. Additionally, in December 2007 Richards released a download-only Christmas single via iTunes of "Run Rudolph Run"; and the B-side was a 2003 recorded version of the famous reggae song "Pressure Drop" featuring Toots Hibbert singing with Richards backed by original Maytals band members Jackie Jackson and Paul Douglas.
 Links: a. Hank Williams b. Burn Your Playhouse Down – The Unreleased Duets c. Grammy Award d. Burn Your Playhouse Down – The Unreleased Duets


Output: b