Question: Who was the starting quarterback for the vikings?
Disambiguated questions and answers: question: Who was the starting quarterback for the Vikings in 2017?
Who was the starting quarterback for the Vikings in 2016?
Who was the starting quarterback for the Vikings in 2015?
answer: Case Keenum
Sam Bradford
Teddy Bridgewater
Natural Questions answer: Case Keenum (from the Wikipedia article "List of Minnesota Vikings starting quarterbacks")