Question: Who has the best winning percentage in nfl history?

Disambiguated questions and answers:
context: In the playoffs, Brady led the Patriots to victories over the Indianapolis Colts in the by a score of 20–3 and the Pittsburgh Steelers in the by a score of 41–27. Brady played his best game of the year in Pittsburgh despite requiring intravenous treatment the previous night when he ran a temperature of 103°. Against the NFL's best defense, he recorded a quarterback passer rating of 130.5, his highest of the season. On February 6, 2005, the Patriots narrowly defeated the Philadelphia Eagles, 24–21, to win Super Bowl XXXIX at Alltel Stadium in Jacksonville, Florida. Brady threw for 236 yards and two touchdowns while capturing the Patriots' third championship in four years. They became the first franchise since the Dallas Cowboys in 1992–1995 to win three Super Bowls in four years.
question: What team has the best regular season winning percentage in NFL history?
short_answers: Dallas

Cowboys

Dallas Cowboys
wikipage: Tom Brady

context: No context provided
question: What NFL coach has the best combined regular season and playoff winning percentage in NFL history?
short_answers: Guy Chamberlin

context: Among retired players, Brett Favre and Peyton Manning have the most regular season wins with 186 each. Otto Graham holds the record for the highest winning percentage with a minimum of 50 starts at (57–13–1)
question: What starting quarterback has the best regular season winning percentage in NFL history?
short_answers: Otto Graham

Otto Everett Graham Jr.
wikipage: List of National Football League career quarterback wins leaders ...

context: Thomas Edward Patrick Brady Jr. (born August 3, 1977) is an American football quarterback for the New England Patriots of the National Football League (NFL). Brady has played in nine Super Bowls, winning six of them, the most of any player in NFL history. Due to his numerous accomplishments, records, and accolades, he is considered by many sports analysts to be the greatest quarterback of all time.
question: What team has the best winning percentage in the playoffs in NFL history?
short_answers: New England Patriots

New England

Patriots
wikipage: Tom Brady

context: In the playoffs, Brady led the Patriots to victories over the Indianapolis Colts in the by a score of 20–3 and the Pittsburgh Steelers in the by a score of 41–27. Brady played his best game of the year in Pittsburgh despite requiring intravenous treatment the previous night when he ran a temperature of 103°. Against the NFL's best defense, he recorded a quarterback passer rating of 130.5, his highest of the season. On February 6, 2005, the Patriots narrowly defeated the Philadelphia Eagles, 24–21, to win Super Bowl XXXIX at Alltel Stadium in Jacksonville, Florida. Brady threw for 236 yards and two touchdowns while capturing the Patriots' third championship in four years. They became the first franchise since the Dallas Cowboys in 1992–1995 to win three Super Bowls in four years.
question: What team has the best winning percentage in the regular season and playoffs combined in NFL history?
short_answers: Dallas

Cowboys

Dallas Cowboys
wikipage: Tom Brady

context: Tom Brady holds the NFL record for most playoff wins by a quarterback with 30, and the record for most playoff games started (41). Tom Brady and Joe Flacco are tied for most post-season road wins by a quarterback, with 8. For players with 5 or more playoff appearances, Bart Starr holds the record for the highest winning percentage, (.900) and is second for the record for most championships (5 NFL titles plus 2 Super Bowl wins vs. AFL teams) to Tom Brady, who has won 6 Super Bowls. Six quarterbacks are undefeated in post-season play but all of them have just a single appearance as a starter except for Frank Reich who had two starts. Hall of Fame quarterback Y. A. Tittle shares the record with Andy Dalton for the highest number of playoff starts without ever winning a game (4). John Elway holds the record for the highest number of playoff wins before eventually winning his first Super Bowl (10). Donovan McNabb and Jim Kelly hold the record for the highest number of playoff wins (9) without winning the Super Bowl.
question: What starting quarterback has the best playoff winning percentage in NFL history?
short_answers: Bart Starr
wikipage: List of National Football League quarterback playoff records ...

Long answers:
long_answer: The Dallas Cowboys have the best regular season winning percentage in NFL history, and the New England Patriots have the best percentage in playoff games. When combining regular and playoff season games, the Dallas Cowboys have the record. For starting quarterbacks, Otto Graham holds the record for the best regular season winning percentage in the NFL, and Bart Starr holds that record for playoff games. Guy Chamberlin is the NFL coach with the best combined regular season and playoff winning percentage in NFL history.