TASK DEFINITION: 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.
PROBLEM: 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.


SOLUTION: 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

PROBLEM: Question: Who was the head of the government that recalled Khalid in 841? Passage:Khalid was a member of the Shayban tribe, dominant in the region of Diyar Bakr in the northern Jazira, and third son of Yazid ibn Mazyad al-Shaybani, who served twice as Arab governor (ostikan) of Arminiya (a large province encompassing the whole of Transcaucasia). Khalid served in the same office no less than four times: in 813/814, 828–832, briefly in 841 and again under Caliph al-Wathiq (r. 842–845). In his first tenure, he showed himself conciliatory towards the native Christian population and the nakharar princes, but his second tenure was marked by the brutal suppression of several revolts by local Arab magnates, as well as the harsh treatment of the Christian population. As a result, when his re-appointment to the office was announced in 841, a rebellion broke out, forcing the Abbasid government to recall him immediately. Nevertheless, al-Wathiq assigned Arminiya to Khalid. The latter arrived in the province at the head of an army, and crushed any opposition. He died soon after at Dvin, where he was buried. He was succeeded by his son, Muhammad. His younger son Haytham ibn Khalid ruled in the family's stronghold of Shirvan, and was the first to claim the title of Shirvanshah.


SOLUTION: As a result, when his re-appointment to the office was announced in 841, a rebellion broke out, forcing the Abbasid government to recall him immediately

PROBLEM: Question: In what years did John Angelo Valdemar Østergaard Hansen play football? Passage:John Angelo Valdemar Østergaard Hansen, known simply as John Hansen, (24 June 1924 – 12 January 1990) was a Danish footballer who played as a forward. He played professionally for seven years in Italy: he scored 124 goals in 187 matches for Juventus F.C., and won two Serie A championships with the club, finishing as Capocannoniere top-goal scorer in the 1951–52 Serie A season; he later also played for Italian club S.S. Lazio. He won the 1944 Danish championship with childhood club BK Frem. Hansen scored 10 goals in eight games for the Denmark national football team in 1948, and won a bronze medal with Denmark at the 1948 Summer Olympics. In 1985, Hansen received the Italian order of chivalry.


SOLUTION:
John Angelo Valdemar Østergaard Hansen, known simply as John Hansen, (24 June 1924 – 12 January 1990) was a Danish footballer who played as a forward