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.

Ex Input:
Question: How many soldiers died in the battle that Stanley missed due to illness? Passage:He fought at several battles in Missouri, including the Battle of Wilson's Creek, where he guarded the supply trains. President Abraham Lincoln appointed Stanley as brigadier general September 28, 1861, although the U.S. Senate did not confirm the appointment until March 7, 1862. Fighting in the Western Theater, he participated in the operations against New Madrid, Missouri and the Battle of Island Number Ten. He was involved in numerous major battles, including the Second Battle of Corinth, where he commanded a division of infantry of the Army of the Mississippi, and the Battle of Stones River, in which he led the cavalry of the Army of the Cumberland. On March 11, 1863, Stanley was appointed major general to rank from November 29, 1862. Stanley also led the Union cavalry in the Tullahoma Campaign. He fell ill late in 1863 and missed the Battle of Chickamauga. In 1864, he fought under William Tecumseh Sherman as a division commander in the IV Corps of the Army of the Cumberland during the Atlanta Campaign, and he was promoted to command of the corps when Maj. Gen. Oliver O. Howard was named commander of the Army of the Tennessee. After the capture of the city, instead of employing him marching to the sea, Sherman dispatched Stanley and his IV Corps to Tennessee to help protect the state from invasion by John Bell Hood's Army of Tennessee.
 Links: a. Army of Tennessee b. Missouri c. Battle of Chickamauga d. John Bell Hood

Ex Output:
c


Ex Input:
Question: How old was Rudy Vallee when he reached number 15 on the Billboard charts? Passage:Rudy Vallee was the first artist to make the charts in Billboard magazine with "As Time Goes By" when he took the song to number 15 in 1931, but after the song was featured in the film Casablanca his recording was reissued and spent four weeks at number one in 1943. "Begin the Beguine" was first put on the charts by Xavier Cugat & His Waldorf-Astoria Orchestra with Don Reid on vocal for two weeks in 1935 when it reached number 13. Patti Austin's "We're in Love" made it to number 90 on the magazine's R&B chart in February 1978, and the Expanded Edition CD bonus track "I Never Said I Love You" was first recorded by Barbara Mandrell for her 1976 album Midnight Angel but was a number 84 pop hit for Orsa Lia that also spent a week at number one on the magazine's Easy Listening chart in 1979.
 Links: a. Waldorf Astoria New York b. Casablanca (film) c. Barbara Mandrell d. Rudy Vallée

Ex Output:
d


Ex Input:
Question: What's an instrument strongly associated with the traditional music found in the album's sixth track? Passage:It opens with two club-driven tracks: an interlude titled "Bridge to the Sky", and the promotional titular song. "Disco-munication" is the second interlude on the album, blending "sophisticated" electric guitars with electronic music. "Energize" is another electronic track, and is one of the only numbers on the album that include English phases ("Put your hands up together, keep your heads up forever, let me sing forever,"). The fifth track "Sparkle" was noted as a club song with an electronic arrangement, similar to the follow-up song "Rollin'". Both tracks feature autotune and vocoder pro-tools, a first for Hamasaki. The album's sixth track, "Green", shows a departure from the album's earlier electronic style; it focuses more on older traditional Japanese sound, alongside instrumentation of electric guitars and drums. The album's third interlude, "Load of the Shugyo", was described as an "atmospheric" number with heavy rock instruments in its composition. Rock music is then influenced on the following tracks "Identity"—a song that discusses about self-confidence—the single "Rule", and the tune "Love 'n' Hate", which talks about the effects of lust. The album's fourth and final interlude "Pieces of Seven" was noted for its "atmospheric" sounds of an ocean, until the second half of the track diverges into a harder rock style. "Days" is the album's first pop ballad, and is described as a love song. It closes with the ballad "Curtain Call", which features a choir and piano riffs throughout its composition.
 Links: a. Music of Japan b. Ocean c. Ocean d. Ocean

Ex Output:

a