Question: What team did Rajon Rondo start his NBA career with?

Context paragraphs:
2006 NBA All-Star Game: The 2006 NBA All-Star Game was played on Sunday, February 19, 2006 at the Toyota Center in Houston, Texas, home of the Houston Rockets.  The game was the 55th annual All-Star game.  The theme song was by Houston native Chamillionaire who made a new version of his hit "Turn It Up."  Trailing by 21 points, the East rode the hot shooting of LeBron James and the teamwork of the four All-Stars from the Detroit Pistons to a 122–120 victory over the West.  The 21-year-old James, who scored 29 points and grabbed six rebounds, became the youngest player to win MVP.  With the score tied, Dwyane Wade, who finished with 20 points, hit the game-winning layup with 16 seconds left.  Tracy McGrady of the Houston Rockets led all players with a game-high 36 points.  The Detroit Pistons tied a record with the 1962 Boston Celtics (Sam Jones, Bill Russell, Bob Cousy, Tom Heinsohn), 1975 Celtics (John Havlicek, JoJo White, Dave Cowens, Paul Silas), 1983 Philadelphia 76ers (Julius Erving, Moses Malone, Andrew Toney and Maurice Cheeks), 1998 Lakers (Kobe Bryant, Shaquille O'Neal, Eddie Jones and Nick Van Exel), 2011 Boston Celtics (Rajon Rondo, Kevin Garnett, Paul Pierce and Ray Allen), 2015 Atlanta Hawks (Al Horford, Jeff Teague, Paul Millsap and Kyle Korver), and 2017 Golden State Warriors (Stephen Curry, Kevin Durant, Klay Thompson, and Draymond Green) by sending four players to the All-Star game.

LeBron James: LeBron Raymone James ( ; born December 30, 1984) is an American professional basketball player for the Cleveland Cavaliers of the National Basketball Association (NBA).  James has won three NBA championships, four NBA Most Valuable Player Awards, three NBA Finals MVP Awards, two Olympic gold medals, an NBA scoring title, and the NBA Rookie of the Year Award.  He has also been selected to 13 NBA All-Star teams, 13 All-NBA teams, and six All-Defensive teams, is the Cavaliers' all-time leading scorer, and is the NBA career playoff scoring leader.

Louie Nelson: Louie Nelson (born May 28, 1951) is an American former National Basketball Association (NBA) player.  Nelson was drafted with the first pick in the second round of the 1973 NBA draft by the Baltimore Bullets.  Before the 1974–75 NBA season, Nelson was taken by the New Orleans Jazz in the NBA Expansion Draft.  After playing two seasons with the Jazz, the Jazz waived him.  Nelson was signed by the San Antonio Spurs before the 1976–77 NBA season, but was waived after four games.  In the 1977–78 NBA season, Nelson's final NBA season, he played for the Kansas City Kings and New Jersey Nets.  In his NBA career, Nelson averaged 9.4 points, 2.4 rebounds and 1.9 assists per game.

2012–13 Boston Celtics season: The 2012–13 Boston Celtics season was the 67th season of the franchise in the National Basketball Association (NBA).  The Boston Celtics finished the regular season with a 41–40 won-loss record, which was the 3rd best in the Atlantic division, bringing an end to the 5-year run as Atlantic Champs and 7th best in the East.  Their longest winning and losing streaks were 7 and 6 games respectively.  The leading scorer was Paul Pierce, averaging 18.6 PPG.  The leading rebounder was Kevin Garnett (7.8 RPG).  Rajon Rondo led the team and the league in assists per-game with 11.1 despite only playing 38 games due to ACL injury.  The Celtics only played 81 games as their April 16 game was cancelled in the aftermath of the Boston Marathon bombing and was not rescheduled because it would not have changed any part of the final Eastern Conference standings anyway.  The Celtics would go on to lose in the first round of the playoffs for the first time since the 2004–05 season.  This season would mark the end of the Paul Pierce and Kevin Garnett era in Boston as they were traded to the Brooklyn Nets during the 2013 off-season.

P. J. Brown: Collier "P. J." Brown Jr. (born October 14, 1969) is a retired American professional basketball player who played in the National Basketball Association (NBA).  The 6 ft , 239 lb center/power forward was selected out of Louisiana Tech University by the New Jersey Nets with the 29th overall pick in the 1992 NBA draft, but began his NBA career only in the 1993–94 season.  He has been voted into the NBA All-Defensive Second Team three times, in 1997, 1999 and 2001, and won the NBA Sportsmanship Award in 2004.  He attended Winnfield Senior High School in Winnfield, Louisiana, where he played for the Winnfield Tigers, and has played professionally for the New Jersey Nets, Miami Heat, Charlotte Hornets, New Orleans Hornets, Chicago Bulls and Boston Celtics.

2011–12 Boston Celtics season: The 2011–12 Boston Celtics season was the 66th season of the franchise in the National Basketball Association (NBA).  The Boston Celtics finished the regular season with a 39–27 won-loss record, which was the 4th best in the East, winning their 21st Atlantic Division title.  Their longest winning and losing streaks were 5 games.  The leading scorer was Paul Pierce, averaging 19.4 PPG.  The leading rebounder was Kevin Garnett (8.2 RPG).  Rajon Rondo led the team and the league in assists per-game with 11.7.  The regular season was reduced from its usual 82 games to 66 due to the lockout.  The Celtics made a relatively deep playoff run, challenging the Miami Heat in the Eastern Conference Finals.  They ultimately lost in seven games.  Following the season, Ray Allen left for the Heat, effectively ending the Big 3 era in Boston.

Juwan Howard: Juwan Antonio Howard (born February 7, 1973) is an American retired professional basketball player who currently serves as an assistant coach for the Miami Heat of the National Basketball Association (NBA).  Howard formerly played for the Heat from 2010 until 2013.  A one-time All-Star and one-time All-NBA power forward, he began his NBA career as the fifth overall pick in the 1994 NBA draft, selected by the Washington Bullets.  Before he was drafted, he starred as an All-American on the Michigan Wolverines men's basketball team.  At Michigan he was part of the Fab Five recruiting class of 1991 that reached the finals of the National Collegiate Athletic Association (NCAA) Men's Division I Basketball Championship in 1992 and 1993.  Howard won his first NBA championship with Miami in the 2012 NBA Finals and his second NBA championship in the 2013 NBA Finals.

Anthony Mason (basketball): Anthony George Douglas Mason (December 14, 1966 – February 28, 2015) was an American professional basketball player.  In his 13-year career he played with the New Jersey Nets, Denver Nuggets, New York Knicks, Charlotte Hornets, Milwaukee Bucks and Miami Heat of the National Basketball Association.  He averaged 10.8 points and 8.3 rebounds in his 13-year NBA career.  During the prime of his career in the mid-1990s, he earned the NBA Sixth Man of the Year Award in 1995 and then led the NBA in minutes played in the subsequent two seasons.  In 1997, he earned All-NBA (3rd team) and NBA All-Defensive Team (2nd team).  He was selected to the 2001 NBA All-Star Game.

Rajon Rondo: Rajon Pierre Rondo (born February 22, 1986) is an American professional basketball player for the New Orleans Pelicans of the National Basketball Association (NBA).  He is a four-time NBA All-Star, and a four-time NBA All-Defensive Team member.  He also led the NBA in steals during the 2009–10 season, and assists during the 2011–12, 2012–13 and 2015–16 seasons.  He began his professional career with the Boston Celtics, winning an NBA championship in 2008.  He ranks fourth in Celtic history in assists, and third in steals.  He briefly played for the Dallas Mavericks during the 2014–15 season before joining the Sacramento Kings in 2015 and the Chicago Bulls in 2016.

Danny Green (basketball): Daniel Richard "Danny" Green, Jr. (born June 22, 1987) is an American professional basketball player for the San Antonio Spurs of the National Basketball Association (NBA).  He was a swingman from the University of North Carolina, where he played in more games (145) and had more wins (123) than any Tar Heel before him.  Green is also the only player in the history of the Atlantic Coast Conference (ACC) with at least 1,000 points, 500 rebounds, 250 assists, 150 three-pointers, 150 blocks and 150 steals.  He won an NCAA championship his senior year and was subsequently drafted by the Cleveland Cavaliers with the 46th overall pick in the 2009 NBA draft.  During the 2013 NBA Finals, Green set an NBA record for most three-point field goals made in a Finals series.  He then won an NBA championship with the San Antonio Spurs the following season, and became just the third player from UNC to win an NCAA championship and an NBA championship, the two others being James Worthy, and Michael Jordan.  Known for his perimeter defense and three-point shooting, Green has been a key contributor on both ends on the floor throughout his NBA career, having been selected to his first NBA All-Defensive Second Team in the 2016-17 NBA season.

Supporting paragraphs: 2011–12 Boston Celtics season Rajon Rondo
Answer: Boston Celtics