Question: The 1981 NFL season was the 62nd regular season of the National Football League, that ended with a game between the San Francisco 49ers of the National Football Conference and what winner of the American Football Conference? 

full_context: Document 1: 1981 Philadelphia Eagles season: The 1981 Philadelphia Eagles season resulted in an appearance in the postseason for the fourth straight season (first time in franchise history the Eagles had made the postseason four straight times). The team was coming off a Super Bowl loss to the Oakland Raiders the previous season. Because they made the Super Bowl in 1980, they were picked by many to not only reach the Super Bowl, but to win it as well. The Eagles began the 1981 season with 6 straight wins, their best ever start to a season at the time. The Eagles would win then 3 of their next 5 games to sit at 9-2. They would then lose their next 4 games to slip to 9-6 and were in danger of missing out on the playoffs. The next week, they hammered the Cardinals 38-0 to clinch a playoff berth for the fourth straight season. In the playoffs, they met their arch rivals the Giants. It was New York's first playoff appearance in 18 years. In the game, the Giants would stun the eagles 27-21, ending the Eagles seasons as well as hopes for a second straight Super Bowl appearance. The Eagles would not make the playoffs again until 1988. They also wouldn't reach the Super Bowl again until 2004.
Document 2: Super Bowl XIX: Super Bowl XIX was an American football game between the American Football Conference (AFC) champion Miami Dolphins and the National Football Conference (NFC) champion San Francisco 49ers to decide the National Football League (NFL) champion for the 1984 season. The 49ers defeated the Dolphins by the score of 38–16, to win their second Super Bowl. The game was played on January 20, 1985, at Stanford Stadium, on the campus of Stanford University in Stanford, California, a suburb of Silicon Valley within the San Francisco Bay Area.
Document 3: 1986 NFL season: The 1986 NFL season was the 67th regular season of the National Football League. The defending Super Bowl Champion Chicago Bears shared the league's best record with the Giants at 14-2, with the Giants claiming the spot in the NFC by tiebreakers. In the AFC, the Cleveland Browns earned home-field advantage with a record of 12-4, and they hosted the New York Jets in round one of the AFC playoffs. The Jets had started the season at 10-1 before losing their final five contests. The game went to double OT, with the Browns finally prevailing 23-20. The following Sunday, John Elway and the Denver Broncos defeated the Browns by an identical score in the game known as The Drive, where Elway drove his team 98 yards to send the game to overtime to win. The Giants would defeat their rival Washington Redskins in the NFC title game, blanking them 17-0 to advance to their first Super Bowl. The season ended with Super Bowl XXI when the New York Giants defeated the Denver Broncos 39-20 at the Rose Bowl to win their first league title in 30 years.
Document 4: 1981 NFL season: The 1981 NFL season was the 62nd regular season of the National Football League. The season ended with Super Bowl XVI when the San Francisco 49ers defeated the Cincinnati Bengals 26-21 at the Pontiac Silverdome in Michigan.
Document 5: The Catch (American football): The Catch refers to the winning touchdown pass in the 1981 NFC Championship Game played between the Dallas Cowboys and San Francisco 49ers at Candlestick Park on January 10, 1982, as part of the 1981–82 NFL playoffs following the 1981 NFL season. With 58 seconds left in the game, San Francisco wide receiver Dwight Clark made a leaping grab in the back of the end zone to complete a 6-yard touchdown pass from quarterback Joe Montana, enabling the 49ers to defeat the Cowboys, 28–27. "The Catch" is widely regarded as one of the most memorable events in National Football League (NFL) history. The game represented the end of the Cowboys' domination in the NFC since the conference's inception in 1970, and the beginning of the 49ers' rise as an NFL dynasty in the 1980s.
Document 6: Super Bowl XXXI: Super Bowl XXXI was an American football game between the American Football Conference (AFC) champion New England Patriots and the National Football Conference (NFC) champion Green Bay Packers to decide the National Football League (NFL) champion for the 1996 season. The Packers defeated the Patriots by the score of 35–21, earning their third overall Super Bowl victory, and their first since Super Bowl II. The Packers also extended their league record for the most overall NFL championships to 12. It was also the last in a run of 13 straight Super Bowl victories by the NFC over the AFC. The game was played on January 26, 1997 at the Louisiana Superdome in New Orleans, Louisiana.
Document 7: Super Bowl XVI: Super Bowl XVI was an American football game between the National Football Conference (NFC) champion San Francisco 49ers and the American Football Conference (AFC) champion Cincinnati Bengals to decide the National Football League (NFL) champion for the 1981 season. The 49ers defeated the Bengals by the score of 26–21 to win their first Super Bowl.
Document 8: Super Bowl XI: Super Bowl XI was an American football game between the American Football Conference (AFC) champion Oakland Raiders and the National Football Conference (NFC) champion Minnesota Vikings to decide the National Football League (NFL) champion for the 1976 season. The Raiders defeated the Vikings by the score of 32–14 to win their first Super Bowl. The game was played on January 9, 1977, at the Rose Bowl in Pasadena, California. This is, and remains, the earliest scheduled Super Bowl during the calendar year.
Document 9: Super Bowl I: The first AFL-NFL World Championship Game in professional American football, known retroactively as Super Bowl I and referred to in some contemporaneous reports, including the game's radio broadcast, as the Super Bowl, was played on January 15, 1967 at the Los Angeles Memorial Coliseum in Los Angeles, California. The National Football League (NFL) champion Green Bay Packers defeated the American Football League (AFL) champion Kansas City Chiefs by the score of 35–10.
Document 10: 1981 Baltimore Colts season: The 1981 Baltimore Colts season was the 29th season for the team in the National Football League (NFL). The Colts finished the NFL's 1981 season with a record of 2 wins and 14 losses, and tied for fourth in the AFC East division with the New England Patriots. However, the Colts finished ahead of New England in the AFC East based on head-to-head sweep (2–0). The victories over New England occurred on the first and last games of the season; Baltimore lost 14 games in between victories. They also won the two games by a combined 3 points, winning 29-28 the first time, and 23-21 the second time.
Document 11: Super Bowl XV: Super Bowl XV was an American football game between the American Football Conference (AFC) champion Oakland Raiders and the National Football Conference (NFC) champion Philadelphia Eagles to decide the National Football League (NFL) champion for the 1980 season. The Raiders defeated the Eagles by the score of 27–10, becoming the first wild card playoff team to win a Super Bowl.
Document 12: 1981 San Francisco 49ers season: The 1981 San Francisco 49ers season was their 32nd season in the National Football League. Under third-year head coach Bill Walsh, the team finished the regular season with a 13–3 record. The season would be one of the franchise's most successful seasons to that point and would be 'the birth of a dynasty', when the 49ers began their decade of dominance. The 49ers drew an average home attendance of 54,399 in the 1981 NFL season.
Document 13: Super Bowl XX: Super Bowl XX was an American football game between the National Football Conference (NFC) champion Chicago Bears and the American Football Conference (AFC) champion New England Patriots to decide the National Football League (NFL) champion for the 1985 season. The Bears defeated the Patriots by the score of 46–10, capturing their first NFL championship (and Chicago's first overall sports victory) since 1963, three years prior to the birth of the Super Bowl. Super Bowl XX was played on January 26, 1986 at the Louisiana Superdome in New Orleans. This was the first of nine Super Bowl appearances for New England.
Document 14: 1981 Clemson Tigers football team: The 1981 Clemson Tigers football team represented Clemson University in the Atlantic Coast Conference. The Tigers were led by head coach Danny Ford and played their home games in Memorial Stadium. Clemson finished their undefeated 1981 season with a 22–15 victory over the #4 Nebraska Cornhuskers in the 1982 Orange Bowl, and were voted #1 in the Associated Press (AP) and United Press International (UPI) polls.
Document 15: 1981 Denver Broncos season: The 1981 Denver Broncos season was the team's 22nd year in professional football and its 12th with the National Football League (NFL). The 1981 season depicted Denver trying to improve on their 8-8 record in 1980. They did improve on their record, finishing 10-6. However, they would miss the playoffs by virtue of their head to head loss to the Buffalo Bills during the season. After a very fast 8-3 start, Denver would lose 3 of their final 5 games, including a critical loss to the Cincinnati Bengals in week 12. Denver would finish 8-0 at home, but a 2-6 road record proved to doom the Broncos at season's end.
ground_truth: Cincinnati Bengals