Question: Who's the starting quarterback for the vikings?

Disambiguated questions and answers:
context: No context provided
question: Who was the starting quarterback for the Vikings in 2017?
short_answers: Sam Bradford
Case Keenum
context: In 2009, the Vikings recruited veteran quarterback Brett Favre out of retirement to be their new starting quarterback. In Week 13 of the 2010 season, Favre suffered a chest injury that ended his NFL-record streak of consecutive starts at 297 (321 including postseason games), and Tarvaris Jackson reclaimed the starting spot for Week 14. However, Jackson was injured himself in Week 15, giving rookie Joe Webb a chance to stake a claim for the position. He was unable to hold onto the position as Donovan McNabb was signed as a free agent to replace Favre, who retired at the end of the 2010 season. After going 1–5 through the first six games of 2011, though, McNabb was replaced by first-round draft pick Christian Ponder, who retained the starting position for the remainder of the season and for the whole of 2012. However, he was plagued by indifferent form and the Vikings signed Matt Cassel – recently released by the Kansas City Chiefs. When Ponder suffered an injury early in the 2013 season, Cassel was given his first start for the Vikings in week 4 in the NFL International Series game against the Pittsburgh Steelers at Wembley Stadium, London. He started the following game, but was replaced in week 7 by Josh Freeman, recently signed after his release by the Tampa Bay Buccaneers. However, he was injured during the game and did not make another start for the Vikings, allowing Ponder to reclaim the starting role. Cassel then returned as the starter in week 14, and retained the role for the rest of the season and into 2014. After three games, he was placed on injured reserve and first-round draft pick Teddy Bridgewater took over for the week 4 game against the Atlanta Falcons. Bridgewater himself was injured late in the game, allowing Ponder the chance to come back in for the following week, but the rookie soon returned and has held the starting berth until suffering a knee injury in practice during the 2016 preseason. Shaun Hill started the season opener and Sam Bradford took over in week 2. Ahead of the 2018 season, the Vikings signed free agent quarterback Kirk Cousins from the Washington Redskins on a three-year, fully guaranteed $84 million contract. He started 31 consecutive regular season games to start his Vikings career before sitting out the final game of 2019 with the team's playoff berth already secured; Sean Mannion started in his place.
question: Who was the starting quarterback for the Vikings in 2016?
short_answers: Sam Bradford
Shaun Hill
wikipage: List of Minnesota Vikings starting quarterbacks
context: No context provided
question: Who was the starting quarterback for the Vikings in 2015?
short_answers: Teddy Bridgewater

Long-form answers:
knowledge: content: The Minnesota Vikings are a professional American football team based in Minneapolis. They are members of the North Division of the National Football Conference (NFC) in the National Football League (NFL). 
wikipage: List of Minnesota Vikings starting quarterbacks
content: Bridgewater entered the season as the second-string quarterback, behind veteran Matt Cassel, but ahead of Christian Ponder.[37] Bridgewater made his NFL debut on September 21, 2014, against the New Orleans Saints, entering in relief of the injured Cassel and finishing the game with 150 passing yards.[38] He was named the starting quarterback for the remainder of the season after Cassel, who broke his foot in the aforementioned game, was placed on injured reserve.
wikipage: Teddy Bridgewater
content: On March 10, 2015, Hill signed with the Minnesota Vikings.[19] In Week 9 against the St. Louis Rams, Teddy Bridgewater left the game in the second half with a concussion. Hill took over for the rest of the game, which the Vikings won 21-18 in overtime.
wikipage: Shaun Hill
content: On September 3, 2016, following his appearance in the Eagles' preseason games, Bradford was traded to the Minnesota Vikings for a first-round pick in the 2017 NFL Draft (later used to select Derek Barnett) and a conditional fourth-round pick in the 2018 NFL Draft.[129][130] The trade was made after Vikings quarterback Teddy Bridgewater suffered a season-ending ACL tear during team practice on August 30, 2016.[131]

Fifteen days after being traded, Bradford made his first start for the Vikings in Week 2 against the Green Bay Packers, despite not having much time to learn the offense. Bradford ended up hurting his left hand in the first half due to a hit by Clay Matthews.
wikipage: Sam Bradford
content: After starter Sam Bradford was injured, Keenum came in and had a career year, setting highs in starts, passing yards, completions, and touchdowns. He led the Vikings to a 13-win regular season, followed by a last-second win, known as the Minneapolis Miracle, over the New Orleans Saints in the playoffs.
wikipage: Case Keenum
long_answer: The Minnesota Vikings are a professional American football team based in Minneapolis, who are members of the North Division of the National Football Conference in the National Football League. Teddy Bridgewater became the starting quarterback for the team in 2015, after current staring quarterback Matt Cassel was place on injured reserve. In 2016, Shaun Hill took over the position when Teddy Bridgewater left the game in the second half with a concussion and Sam Bradford was also traded to the team that year as a starting quarterback after an ACL tear Teddy Bridgewater suffered. In 2017, after Bradford was then injured, Case Keenum took the position and had a career year, setting highs in starts, passing yards, completions, and touchdowns, and leading the Vikings to a 13-win regular season, followed by a last-second win, known as the Minneapolis Miracle, over the New Orleans Saints in the playoffs.