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: How many songs are on the album that "Sometimes" is part of? Passage:Before recording her debut album, Spears had originally envisioned it in the style of "Sheryl Crow music, but younger [and] more adult contemporary". However, the singer agreed with her label's appointment of producers, who had the objective to reach a teen public at the time. She flew to Cheiron Studios in Stockholm, Sweden, where half of the album was recorded the spring of 1998, with producers Max Martin, Denniz Pop and Rami Yacoub, among others. "Sometimes" was written by Jörgen Elofsson, and produced by Per Magnusson and David Kreuger. Spears recorded the vocals for the song in May 1998, at Cheiron Studios in Stockholm, Sweden. It was also mixed at Cheiron Studios by Martin. Esbjörn Öhrwall played the acoustic guitar, while bass guitar was done by Thomas Lindberg. Keyboards and programming was done by Kreuger, and additional keyboards by Magnusson. Background vocals were provided by Anders von Hoffsten. Spears also co-wrote and recorded a track called "I'm So Curious", produced by Eric Foster White, that was released as a B-side to "Sometimes". The track was recorded in 1997 at 4MW East Studios in New Jersey. "Sometimes" was released as the second single from ...Baby One More Time on April 30, 1999.
 Links: a. ...Baby One More Time (album) b. A-side and B-side c. Keyboard instrument d. Sheryl Crow

Output: a


Input: Consider Input: Question: How old was Kennedy when he was assassinated? Passage:1964 is a documentary film produced by Insignia Films for the American Experience series about political, social and cultural events in the United States for the calendar year 1964. It is based partly on Jon Margolis book The Last Innocent Year: America in 1964. The documentary depicts the year 1964 as significant and epic in that following the assassination of President John F. Kennedy in late 1963, 1964, as a presidential election year, becomes a departure point for American history, with lasting effects today. It is also the year of the British Invasion led by the Beatles, when Cassius Clay fights Sonny Liston for the World Heavyweight Championship, the year after Betty Friedan's book, The Feminine Mystique, is published, and the year Republican activist, Phyllis Schlafly's book, A Choice, Not an Echo, is published. It is also the year of Freedom Summer, an initiative by the Student Nonviolent Coordinating Committee to register African-Americans in Mississippi, the subsequent murders of Chaney, Goodman, and Schwerner, three CORE activists, in Mississippi by white supremacists that created a national sensation, and the Harlem riot of 1964, culminating in the Berkeley Free Speech Movement at the University of California at Berkeley. A recurrent theme of the film is its departure as a presidential election year, with President Lyndon B. Johnson running as the expected Democratic Party nominee and the nomination of U.S. Senator Barry Goldwater selected through a grassroots campaign for the Republican nomination for President of the United States, that defines the future divisions of the US political party competition.
 Links: a. British Invasion b. Harlem riot of 1964 c. Assassination of John F. Kennedy d. Muhammad Ali

Output: c


Input: Consider Input: Question: How old was the quarterback during Rahne's first year as a quarterback coach? Passage:Following coach James Franklin, Rahne spent the 2014 and 2015 seasons as the Penn State Nittany Lions quarterbacks coach. Working with quarterback Christian Hackenberg, Rahne helped him break all of the Nittany Lions major career passing records. Hackenberg finished his career with 693 completions, 8,457 passing yards, 48 touchdown passes, 9 career 300-yard passing games, and 21 200-yard passing games. After the final game of the 2015 regular season, John Donovan was fired as Penn States offensive coordinator, and replaced by Rahne as the interim to coach the TaxSlayer Bowl. During preparation for the bowl game, it was announced that ex-Fordham Head coach, Joe Moorhead would be taking over as offensive coordinator and quarterbacks coach for the 2016 season. Rahne took over as tight ends coach, a position that was previously held by Donovan. In this role Rahne mentored Mackey Award finalist Mike Gesicki as he broke the Penn State career record for receptions (123), receiving yards (1,419) and touchdowns (15) by a tight end. Gesicki was selected first-team All-Big Ten in 2017 and second team in 2016. Gesicki set single-season records at Penn State for receptions (51), receiving yards (679) and touchdown catches (9) by a tight end. On December 1, 2017, Rahne was named Penn States offensive coordinator and quarterbacks coach after Joe Moorhead left the Nittany Lions to become the head coach at Mississippi State. In his first game as a full-time offensive coordinator, Rahne led Penn State's offense to a Fiesta Bowl record 545 yards of total offense in a 35-28 win over Washington.
 Links: a. Mike Gesicki b. 2017 All-Big Ten Conference football team c. Penn State Nittany Lions football d. Mississippi State Bulldogs football


Output: c