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: How old was Waledyński when the autocephaly he requested was finally granted? Passage:The establishment of the church was undertaken after the Treaty of Riga left a large amount of territory previously under the control of the Russian Empire, as part of the Second Polish Republic. Eastern Orthodoxy was widespread in the Belarusian Western Belarus regions and the Ukrainian Volhynia. The loss of ecclesiastical link due to the persecution of the Russian Orthodox Church in the Soviet Union, left the regional clergy in a crisis moment, and in 1924, the Ecumenical Patriarchate took over establishing several autonomous churches on territories of the new states that were formerly wholly or partially part of the Russian Empire (Finland, the Baltic States, and Poland). Earlier, in January 1922, the Polish government had issued an order recognizing the Orthodox church and placing it under the authority of the state. At that time a Ukrainian, Yurii Yaroshevsky, was appointed Metropolitan and exarch by the patriarch of Moscow. When Yaroshevsky began to reject the authority of Moscow Patriarchate, he was assassinated by a Russian monk. Nonetheless, his successor, Dionizy Waledyński (Dionisii Valedinsky), continued to work for the autocephaly of the Polish Orthodox church, which was finally granted by the Ecumenical Patriarch of Constantinople in his Tomos of 13 November 1924. Given that most of the parishioners were Ukrainians and Belarusians living in the Eastern areas of the newly independent Polish Second Republic, the Patriarch of Constantinople had a canonical basis to grant the Tomos to the Polish church as a successor of the Kyiv Metropolia, the former territory of Kyivan Rus' which Constantinople continued to see as its canonical territory (despite having agreed to allow Moscow to be its caretaker it in 1686). The Russian Orthodox Church at the time did not recognise the Polish autocephaly, as it did not recognise the autocephaly of the Orthodox Church of the Czech Lands and Slovakia. 
 Links: a. Second Polish Republic b. 2018 Moscow–Constantinople schism c. Ecumenical Patriarchate of Constantinople d. Dionizy (Waledyński)
Example Output: d

Example Input: Question: Which of the two companies that posted previews  of Somebody to Love was founded first? Passage:A preview of the video was posted on AOL's PopEater.com, and subsequently on Bieber's VEVO channel, including behind the scenes clips of Bieber with the dancers, and highlights of the video with Usher and in front of a green screen. Bieber said, "It's really awesome to be able to work with professional dancers, you know, people that were in, like, ABDC, and also got an approval from choreographer Jamaica, who said Bieber was "killing it" and that she didn't have to give him any corrections. It made its premiere during the June 17, 2010 results show of the seventh season of So You Think You Can Dance, and was introduced by Usher after his performance of "OMG". It later premiered that night on VEVO and on June 18, 2010 on 20/20at the end of their show. The video features dance crews including, America's Best Dance Crew season 5 winners Poreotics, and Season 3's runner up Beat Freaks, as well as The Syrenz, LXD, Medea Sirkas, solo acts Simrin Player and Bboy Fly, and other dancers and crews. Singer/actress and model Katerina Graham makes a cameo in a scene with Poreotics. Bieber's best friend Ryan Butler, who appeared in the "One Time" video, also appears alongside Bieber, wearing a T-shirt advertising his Twitter account. According to Tamar Antai of MTV News the video "makes vague allusions" to clips for Busta Rhymes' "Pass the Courvoisier, Part II" and Chris Brown's "Wall to Wall". A backpack choreography scene with LXD recalls Usher's 1997 video for "You Make Me Wanna".
 Links: a. AOL b. 20/20 (American TV program) c. MTV News d. One Time (Justin Bieber song)
Example Output: a

Example Input: Question: Who was the winner of World Twenty20 the year nine matches were held at Vidarbha Cricket Association Stadium? Passage:The Vidarbha Cricket Association Stadium, also known as the New VCA Stadium, is a cricket ground in Nagpur, India. It is the home of the Vidarbha cricket team in the Ranji Trophy and the Central Zone cricket team in the Duleep Trophy. It is also a Test, One Day International and Twenty20 International (T20) venue. The ground was opened in 2008. It replaced the Vidarbha Cricket Association Ground as the city's primary cricket venue. The new Vidarbha Cricket Association Stadium has a capacity of 45,000 spectators. It has been praised by the International Cricket Council, and also by players, commentators and journalists because of its facilities. The ground has hosted six Test matches, the first in 2008 when Australia lost to India by 172 runs. It has also staged eight One Day International matches, the first of which was in 2009 when India beat Australia by 99 runs. Eleven Twenty20 Internationals have been played at the ground, the first when India played Sri Lanka in 2009. Of the eight One Day Internationals played at the stadium, four matches were held during the group stage of the World Cup in 2011. Of the eleven Twenty20 Internationals staged at the venue, nine matches were staged during the World Twenty20 in 2016.
 Links: a. India b. Ranji Trophy c. One Day International d. 2016 ICC World Twenty20
Example Output:
d