Question: What team did the Pittsburgh Penguins lose to in the opening round to the eventual Stanley Cup?

Context paragraphs:
1989–90 Los Angeles Kings season: The 1989-90 Los Angeles Kings season saw the Kings compile a record of 34-39-7 for 75 points, good enough for fourth place in the Smythe Division.  They defeated the defending Stanley Cup champion Calgary Flames in the first round of the playoffs before falling to the eventual Stanley Cup champion Edmonton Oilers in the second round.  For the Kings, this was the second consecutive year that they eliminated the defending Stanley Cup champions in the first round of the playoffs, only to be swept in the following round by the eventual Cup champions.  In both years, they involved both teams from the province of Alberta.

Kris Letang: Kristopher Allen "Kris" Letang (born April 24, 1987) is a Canadian professional ice hockey defenceman and alternate captain for the Pittsburgh Penguins of the National Hockey League (NHL).  He played juniors in the Quebec Major Junior Hockey League (QMJHL) for three seasons, during which time he was selected 62nd overall by the Penguins in the 2005 NHL Entry Draft.  In his second full NHL season, Letang won the Stanley Cup with Pittsburgh, became a two time Stanley Cup Champion when the Penguins beat the Sharks in 2016, and became a three time Stanley Cup Champion when the Penguins beat the Predators in 2017.  Internationally, he has competed for Canada at the under-18 and under-20 levels, winning back-to-back gold medals at the World Junior Championships in 2006 and 2007.

2016–17 Ottawa Senators season: The 2016–17 Ottawa Senators season was the 25th season (24th season of play) of the Ottawa Senators of the National Hockey League (NHL).  After failing to make the playoffs in 2015–16, the Senators replaced their management and coaching staff, promoting Pierre Dorion to general manager, and hiring Guy Boucher and Marc Crawford and assistants to coach the team.  The team would defy the predictions of much of the media by qualifying for the Stanley Cup playoffs, and then by winning two rounds in the playoffs before losing in double overtime in game seven of the Eastern Conference Final to the eventual Stanley Cup champion Pittsburgh Penguins.

1981–82 New York Islanders season: The 1981-82 New York Islanders season was the tenth season in the franchise's history.  It involved winning the Stanley Cup.

1991 Stanley Cup Finals: The 1991 Stanley Cup Finals was contested by the Pittsburgh Penguins and the Minnesota North Stars.  It was the Penguins' first Final series appearance and their first Stanley Cup victory.  This is the first and only (through 2017) Stanley Cup Final to feature two teams from the expansion group of 1967.  It was Minnesota's second Final series appearance, and their last before the franchise's relocation to Dallas two years later.  It was also the first time since that an American franchise would win the Stanley Cup.  This was the first all-American finals since , which also featured the North Stars in their first appearance.

2016–17 NHL season: The 2016–17 NHL season was the 100th season of operation (99th season of play) of the National Hockey League.  Thirty teams were competing in an 82-game regular season from October 12, 2016, to April 9, 2017.  The 2017 Stanley Cup playoffs began on April 12 and concluded on June 11, with the Pittsburgh Penguins winning the Stanley Cup over the Nashville Predators in 6 games.  On June 11, the Pittsburgh Penguins became the first team to repeat as Stanley Cup champions since the Detroit Red Wings in 1997–98, winning their franchise's fifth Stanley Cup and their third in nine seasons.

Pittsburgh Penguins: The Pittsburgh Penguins are a professional ice hockey team based in Pittsburgh, Pennsylvania.  They are members of the Metropolitan Division of the Eastern Conference of the National Hockey League (NHL).  The franchise was founded in 1967 as one of the first expansion teams during the league's original expansion from six to twelve teams.  The Penguins played in the Civic Arena, also known to Pittsburgh fans as "The Igloo", from the time of their inception through the end of the 2009–10 season.  They moved into their new arena, PPG Paints Arena, to begin the 2010–11 season.  They have qualified for six Stanley Cup Finals, winning the Stanley Cup five times – in 1991, 1992, 2009, 2016, and 2017.  Along with the Edmonton Oilers, the Penguins are tied for the most Cup championships among non-Original Six teams.  With their Stanley Cup wins in 2016 and 2017, the Penguins became the first back-to-back champions in 19 years (since the 1997–98 Detroit Red Wings) and the first team to do so since the introduction of the salary cap.

1998 Stanley Cup Finals: The 1998 Stanley Cup Finals was the championship series of the National Hockey League's (NHL) 1997–1998 season, and the culmination of the 1998 Stanley Cup playoffs.  It was contested by the Western Conference champion and defending Stanley Cup champion Detroit Red Wings and the Eastern Conference champion Washington Capitals.  It was the 105th year of the Stanley Cup being contested.  The series was the Capitals' first appearance in a Stanley Cup Final since the franchise's inception in 1974.  The Red Wings won the series for the second year in a row, four games to none.  It was the Wings' ninth Stanley Cup, and the most recent time when a Finals concluded with a sweep (as of 2017).  This was also the last time until that a Stanley Cup Finals ended after an NBA Finals in the same season had concluded.  Detroit coach Scotty Bowman won his eighth Stanley Cup in that capacity (having previously done so with the Montreal Canadiens in , , , , and , the Pittsburgh Penguins in , and the Wings the previous year), tying him with former Canadiens coach Toe Blake for the record of most Cups won by a coach (which he would break when he helped the Red Wings win the 2002 Cup).

1981–82 Pittsburgh Penguins season: The 1981–82 Pittsburgh Penguins season was their 15th in the National Hockey League.  The qualified for the playoffs for the fourth straight year, but lost in the opening round to the eventual Stanley Cup champion New York Islanders three games to two.  This would be the Penguins last playoff appearance until 1989.

1992 Stanley Cup Finals: The 1992 Stanley Cup Finals NHL championship series was contested by the Prince of Wales Conference and defending Stanley Cup champion Pittsburgh Penguins and the Clarence Campbell Conference champion Chicago Blackhawks.  The Blackhawks were appearing in their first Finals since .  After the Blackhawks jumped to an early 4–1 lead in the first game of the series, Mario Lemieux and the Penguins came back to win the game, sweep the series in four games, and win their second consecutive and second overall Stanley Cup.  It was the 99th year of the Stanley Cup, and the first to extend into the month of June.  It was the last final for Chicago Stadium as it closed in 1994.

Supporting paragraphs: 1981–82 Pittsburgh Penguins season 1981–82 New York Islanders season
Answer: New York Islanders