The relevant information to answer the above question is: He ranks 12th in NBA history in career regular season triple-doubles (28), and fourth in career playoff triple-doubles (10).is the reasoning for what question and answer pair?
Q: Rondo played two years of college basketball for the Kentucky Wildcats before he was drafted 21st overall by the Phoenix Suns in the 2006 NBA draft. He was subsequently traded to the Celtics where he played a supporting role during his rookie season. He established himself as the starting point guard for the Celtics during the 2007 -- 08 season, helping the franchise record their 17th NBA championship playing alongside All-Stars Ray Allen, Kevin Garnett and Paul Pierce. His breakout performance came during the 2009 NBA Playoffs, where he averaged a near triple-double, and helped his team take the eventual Eastern Conference champion Orlando Magic to seven games in the Conference Semifinals. Rondo is considered to be one of the premier triple-double threats in the NBA. He ranks 12th in NBA history in career regular season triple-doubles (28), and fourth in career playoff triple-doubles (10).

Based on this passage, how many triple doubles does rondo have in his career?
A: career regular season triple - doubles ( 28 ) , and fourth in career playoff triple - doubles ( 10 )