In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.
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Question: Question: How many bands competed in the Union Grove Fiddler's Convention competition against John Herald and his band? Passage:In 1958, Herald formed The Greenbriar Boys, along with Bob Yellin (banjo) and Paul Prestopino (mandolin). The following year, Eric Weissberg (mandolin and fiddle), replaced Prestopino, and Weissberg was soon replaced by Ralph Rinzler (mandolin) to form their most successful combination. Herald was lead guitarist and vocalist. The trio often played the Greenwich Village scene, but were notable enough to be the first Northern group to win the likes of the Union Grove Fiddler's Convention competition, where Yellin also took top honors for banjo. Shortly after backing Joan Baez on her second LP, The Greenbriar Boys were signed to Vanguard Records, for whom they released three records. In 1969, Linda Ronstadt recorded Herald's "High Muddy Water." Two years previously, she had recreated his vocal of Mike Nesmith's "Different Drum," which became a hit for her band the Stone Poneys.

Answer: The trio often played the Greenwich Village scene, but were notable enough to be the first Northern group to win the likes of the Union Grove Fiddler's Convention competition, where Yellin also took top honors for banjo

Question: Question: What is the population of the city the yeshiva fled from? Passage:When the Bolsheviks revolted, the yeshiva was forced to flee from Lithuania to Kletsk, Poland. During his three years in Kletsk, Yechiel Michel attended the famed Talmudic lectures of Rabbi Meltzer and his son-in-law, Rabbi Aharon Kotler. Then he transferred to the Mir yeshiva, where he became a leading student of Rabbi Yeruchom Lebovitz and learned together with Rabbi Yechiel Michel Schlesinger, future rosh yeshiva of Yeshivas Kol Torah in Jerusalem, and Rabbi Yonah Karpilow of Minsk, who was killed in the Holocaust and whose Yonas Eilem was published posthumously. At this time, Rabbi Chaim Shmuelevitz and Rabbi Aryeh Leib Malin also studied in the Mir yeshiva. Despite being surrounding by such luminaries in Torah, R' Yechiel Michel was nonetheless thought of as "the genius of the yeshiva".

Answer: When the Bolsheviks revolted, the yeshiva was forced to flee from Lithuania to Kletsk, Poland

Question: Question: How long had Tommy Allen play for Southampton before he turned down the contract? Passage:One of the later signings of the summer was goalkeeper Len Hill, who joined from Queens Park Rangers in June 1925. Regular keeper Tommy Allen had turned down a new contract at the club, leading to the signing of Hill as his replacement. Allen later agreed to new terms in October and returned to his place as first-choice Southampton goalkeeper, with Hill making sporadic appearances later in the season. Transfer activity continued throughout the season. In December 1925 the club signed inside-forward Jim Swinden from Salisbury City, following a trial in which he scored two goals on his debut for the reserve side against Folkestone. In March 1926, right-half Bill Adams joined from Southern League side Guildford United. Needing money to purchase the freehold of The Dell, Southampton sold mainstay full-backs Fred Titmuss and Tom Parker in early 1926 the former in February to Plymouth Argyle for 1,750; the latter in March to Arsenal for 3,250 which "caused uproar amongst supporters".

Answer:
Regular keeper Tommy Allen had turned down a new contract at the club, leading to the signing of Hill as his replacement